Yap
yap is an ephemeral, real-time chat room with up to six participants. your messages appear and disappear as quickly as you type them, which means unless you pay attention to what everyone says (for once), you’ll miss it.
Link tags: chatting
2
Google Talk: Google Talk Help
How to set up iChat to use your Gmail address for a Jabber account (useful for Twitter). I set this up a while back but recently a few people have been asking about this.