Seems Google Talk, Google's instant messenger service, is now available. Uses the open source Jabber/XMPP protocol. Because of this, it is more cross platform friendy - i.e. you can cmmunicate with users on Mac, Linux etc - but not with AIM or MSN Messenger users. Requires a Gmail account. Very basic, no rich text or smilies. Links to Gmail inbox and allows you to email by clicking the familiar Gmail logo next to a name.