Techwalla is pleased to announce the launch of PartyChat for Google Talk. PartyChat is like a group chat, except that it's less obtrusive and persistent across different login sessions.
For example, say your friends are in a party chat named "drivel". To enter the chat, IM firstname.lastname@example.org with the line "/enter drivel." After that, you'll receive messages sent in "drivel" from email@example.com and all messages you send to firstname.lastname@example.org will be broadcasted to your friends in "drivel."
If you log out of Google Talk and then log back in, you're still in the party chats you were in prior to logging out. To leave a party chat, IM "/leave" or "/exit" to the address you were chatting with (e.g. email@example.com).
But maybe you want to be in multiple partychats? Instead of firstname.lastname@example.org, you can also connect using email@example.com, firstname.lastname@example.org, email@example.com, and so on, up to firstname.lastname@example.org.
It doesn't matter which PartyChat address your friends are connected to. If your friend Jimmy creates a party chat named jimmy-drivel while talking to email@example.com, you can join by IM'ing "/enter jimmy-drivel" to your own favorite address (like, maybe firstname.lastname@example.org).
So send an im to email@example.com (or firstname.lastname@example.org, email@example.com, etc.), make a chat, join a chat, and have fun!
(Big thanks to Michael Bolin for all his continued help with developing/deploying PartyChat)
Disclaimer: I happen to work for Google. PartyChat was produced without any internal knowledge of Google Talk and is not endorsed by Google in any way. If you have any problems with it, please contact only me.