Google has launched Google Talk a day early. Turns out Google is running one big Jabber server. Get yourself an IM client that is Jabber compatible such as Gaim and do this:

1. Open a client supporting Jabber (AdiumX, Gaim, etc.)

2. Your server name is talk.google.com

3. Your username is the same as your Google ID. Example: user@gmail.com

4. Your password is the same as you use to login to Gmail or other Google login locations.

Update: And now the talk.google.com website is up offering a Windows Jabber client for download, as well as Jabber-compatible instructions for Mac & Linux users.