Here's the latest 2.6.0 version of WeBuzz.  New features are that it can optionally send your location in a message  and it can display the Daily Hadith (a saying by or about Muhammad).

WeBuzz is supposed to support  AIM, Yahoo Messenger, Google Talk, MSN Messenger, ICQ and Facebook , but I got connection errors with AIM and Google Talk. The app hung if I tried to connect to Facebook (I did use my Facebook username as you are supposed to).  I didn't try ICQ, but Yahoo and MSN seem to work.

Another bug is that on my i776 the Menu > Back function didn't work to go back to the menu and I had to kill the app with the red key and start over. Back worked on the Rambler. I don't remember as many bugs in the previous version so I'm not so sure this one is an improvement. It might work better on other phone models

The app "WeBuzz All in One" (177 KB) is ready to download or send to your phone as filename:"WeBuzz260"

Type: Freeware
Vendor: WeBuzz - Product Page, Help, Forum
Data Connection Required: Yes
Minimum Java ME profile: MIDP 2.0
Screen Size:  All
Boost CDMA Compatible: (tested on Motorola Rambler): No
iDEN Compatible: (tested on i776): Yes
Supported iDEN phones: All Falcon Series (i856, i776, i465, i9, i290, etc.)
Filesize: 177 KB

Thanks to Cornell J for  alerting  me that Nimbuzz has been updated.  It's now up to version 1.9 (there was a short-lived 1.83 that I missed).

The biggest change for iDEN users is that the key mapping issues that plagued earlier versions have been mostly fixed.  The OK button still doesn't work (press Call in place of OK) and in some of the menus the right soft key (labeled "Back") doesn't do anything and you have to press the Menu key instead. But everywhere else in the app the soft keys seem to be labeled correctly.

The new version also seems to start up faster and load the contact list more quickly.  Supported communities are Windows Live Messenger,  Yahoo, Facebook Chat,  Google Talk, AIM, MySpace, Twitter and Hyves.

Type: Freeware
Vendor: Nimbuzz - Product Page, Online Help, Forum
Data Connection Required: Yes
iDEN Compatible: (tested on i776): Yes
Boost CDMA Compatible: (tested on Motorola Rambler): Yes
Supported iDEN phones: All Falcon Series with Java (i856, i776, i465, i9, i290, etc.)
Filesize: 349 KB

Nimbuzz released version 1.72 of their multi-protocol IM client for Java phones a couple of days ago. Unlike 1.7,which didn't install on iDEN phones, I had no problems running this latest version on my i776.

There are no new features in 1.72, just the always worthwhile bug fixes and performance improvements.

Supported networks are the same as in version 1.6, Windows Live Messenger,  Skype, Yahoo, Facebook Chat,  Google Talk, AIM, MySpace, ICQ, Twitter, studiVZ, shuelerVZ, Gadu-Gadu and Hyves. Update: Skype support as been removed at Skype's request.

Startup time, always an issue with Nimbuzz on the low spec i776, does seem noticeably faster. Other than that I don't see much difference. Off line Facebook friends are still listed in the buddy list as numbers instead of by name (their names do appear if they go online) and  the OK button and the soft keys are still mapped incorrectly.

Because of the messed up key mappings you need to:

1. Use the green "Call" key as the "OK" key
2. Use the right soft key for the left soft key's action
3. Use the menu key for the  right soft key's action
4. Exception : When entering text in native pop up windows,  the soft keys (labeled OK and Cancel) work as labeled.

Type: Freeware
Vendor: Nimbuzz - Product Page, Online Help, Forum
Data Connection Required: Yes
Supported iDEN phones: All Falcon Series (i776, i465, i9, i290, etc.)
Filesize: 298 KB

I've never posted eBuddy 1.5 because it doesn't install on my i776.  Plus it's supposed to be a very minor update to fix a connection issue on some non-Boost phones. On the other hand eBuddy 1.4 works, although it keeps telling you there is an update available.

Boost apps reader Darren found a version of eBuddy 1.5 that does work on his i9. I tried it on my i776 and it  fails with a "Class Loading Error on "bz.class" just like the other one I tried.  I'm posting it anyway for the benefit of i9 users.  It may work on other models with likely candidate being the i856 because it is the latest models.

If you try this on a phone other than the i9, please post a comment saying if it works or not and I'll update this post.  If you try it and it doesn't work, you can always go back to eBuddy 1.4.

eBuddy supports Yahoo, MSN, GTalk, AIM, ICQ, MySpace and Facebook.

Keys:
1. Press the green "Call" key for "OK" key's action
2. Press the right soft key for the left soft key's action
3. Press the menu key for the  right soft key's action
4. Exception : When entering text in a pop up window the soft keys (labeled OK and Cancel) work as labeled.

Type: Freeware
Vendor: eBuddy- Product Page, Online Help
Data Connection Required: Yes
Supported iDEN phones: Confirmed working on the i9. Does not work on the i776 or i465, use eBuddy 1,4 instead..

Thanks to dontae for finding it on GetJar we have a new IM client to play with. It's WeBuzz and supports AIM, Yahoo Messenger, Google Talk, MSN Messenger, ICQ and Facebook. It seems pretty good. All the keys work, it fits the screen and loads quickly.  The only thing missing is that it doesn't beep or vibrate when you get a new IM.

Setting up Facebook in WeBuzz is a little tricky because you have to use  your Facebook username, NOT the email address that you log into Facebook itself with. Usernames are optional in Facebook, instructions for creating them are in Facebook help.

Type: Freeware
Vendor: WeBuzz - Product Page, Help, Forum
Data Connection Required: Yes
Supported iDEN phones: All Falcon Series (i856, i776, i465, i9, i290, etc.)

dontae

Nimbuzz released version 1.6 of their multi-protocol IM client for Java phones a couple of days ago.

Supported networks are the same as in version 1.5, Windows Live Messenger,  Skype, Yahoo, Facebook,  Google Talk, AIM, MySpace, ICQ, Twitter, studiVZ, shuelerVZ, Gadu-Gadu and Hyves.

It seems to start up a little faster than 1.5 and do a better job of staying connected to Facebook. Other than that I don't see much difference. Off line Facebook friends are still listed in the buddy list as numbers instead of by name and  the OK button and the soft keys are still mapped incorrectly.

Because of the messed up key mappings you need to:

1. Use the green "Call" key as the "OK" key
2. Use the right soft key for the left soft key's action
3. Use the menu key for the  right soft key's action
4. Exception : When entering text in native pop up windows,  the soft keys (labeled OK and Cancel) work as labeled.

Type: Freeware
Vendor: Nimbuzz - Product Page, Online Help, Forum
Data Connection Required: Yes
Supported iDEN phones: All Falcon Series (i776, i465, i9, i290, etc.)

Here's the multi-protocol IM client that Lise found, Papaya Mobile. It supports AIM. Yahoo IM, MSN Messenger, Google Talk and ICQ all at once with a separate tab for each active chat.

The IM feature is pretty well hidden. From the "Home" tab, press left to go to the "Features" tab, then scroll down to "Chat" rooms and press the left soft key to expand it and choose "Add IM"

Papaya has a lot of other features too, it's a social network with Avatars, Friends. Mini-Blogs, Chat rooms, Games, cheap international calling and SMS and what it calls email but is really direct messaging as you can only send email from other Papaya members.

The app is only 110kb, it loads quickly, the user interface is pretty snappy and everything fits nicely on the i776's tiny screen. Except for the OK key, keys are mapped correctly. Use the Call key as the OK key.

There are a couple of things I don't like about Papaya. It doesn't beep or vibrate when you get an IM and you have to give Papaya your mobile phone number to receive an activation PIN. I hope they don't start spamming me with texts.

Type: Freeware
Vendor: Papayamobile- Product Page, Mobile Web,  Online Help, Blog
Data Connection Required: Yes
Supported iDEN phones: All Falcon Series (i776, i465, i9, i290, etc.)

JonnyChat is a free AOL IM (AIM) client that works well on Boost phones. It's fast loading, has a responsive interface and messages arrive instantly. All the keys are mapped correctly except the OK key, use the Call key as OK.

The phone vibrates when you get a new IM and when a buddy logs if the app is running in the foreground. Hat tip to Trinitario for finding this.

Type: Freeware
Vendor: Buildhigh - Product Page
Data Connection Required: Yes
Supported iDEN phones: All Falcon Series (i776, i465, i9, i290, etc.)

Trinitario

Here's the latest Nimbuzz,  version 1.5 full. The user interface has been completely redesigned compared to previous versions.  According to Nimbuzz, the new features in 1.5 are:

• Direct access to active chats and chatrooms from the top of  your buddylist
• Chat previews in the buddylist – easily see what’s going on and monitor multiple chats
• Fast switching between buddylist and chats/chatrooms
• Save space on your screen – chose to view one group at the time
• Quick Navigation to the top or the bottom of your buddylist using right and left navigation keys
• Separate menu icon for settings
• New sounds for chats and messages
• Improved stability and performance

Supported networks are the same as in version 1.1, Windows Live Messenger,  Skype, Yahoo, Facebook,  Google Talk/Orkut, AIM, MySpace, ICQ, Twitter, Giovani, studiVZ, shuelerVZ, Gadu-Gadu and Hyves.

As seems to be the case with many apps on iDEN phones, the OK button and the soft keys are mapped incorrectly.  I's not that hard to compensate if you remember to:

1. Use the green "Call" key as the "OK" key
2. Use the right soft key for the left soft key's action
3. Use the menu key for the  right soft key's action
4. Exception : When entering text in native pop up windows,  the soft keys (labeled OK and Cancel) work as labeled.

Type: Freeware
Vendor: Nimbuzz - Product Page, Online Help, Forum
Data Connection Required: Yes
Supported iDEN phones: All Falcon Series (i776, i465, i9, i290, etc.

I've had a couple of requests for an older release of Nimbuzz' full version. This is version 1.1. Compared with Nimbuzz Lite 1.5 this one adds chat rooms and several additional networks including Twitter and MySpace.

Like every version of Nimbuzz that I've tried there are some issues with key mappings. It's not a big deal if you remember to:
1. Use the green "Call" key as the "OK" key
2. Use the right soft key for the left soft key's action
3. Use the menu key for the  right soft key's action
4. Exception : When entering text in native pop up windows,  the soft keys (labeled OK and Cancel) work as labeled.

Type: Freeware
Vendor: Nimbuzz - Product Page, Online Help, Forum
Data Connection Required: Yes
Supported iDEN phones: All Falcon Series (i776, i465, i9, i290, etc.)