Just finished patching up the Android client I've built and been using for XNA Chat.

There's probably still some bugs in there, and there's more than a couple features missing, but it is fully functional, I use it daily myself.

You can get the latest build here:

https://dl.dropboxusercontent.com/u/9580180/XNAChat%20v1.2.apk

If you use it, let me know what you think/about any bugs or crashes.