Here's a great IRC client that would be fabulous on the Tab:
http://www.youtube.com/watch?v=zBYcI7w-M2k&fmt=22

I haven't IRC'd in years! It still seems pretty cool, though. It uses the notification system to beep the phone if there is a private message. Good for friends that chat in a dedicated room without the need to hold a contact list or use specialized software.