AT&T released their new AT&T Messenger 5.0 IM client (http://www.att.net/messenger), based on the former BellSouth Messenger client acquired from the AT&T purchase of BellSouth almost a year ago.
AT&T Messenger is probably one of the few branded IM clients provided by an Internet provider and only available to their Internet customers. It's currently only available to AT&T FastAccess DSL and AT&T WorldNet customer. There's no expected date for AT&T Yahoo! customers to have access to the client. However, AT&T Messenger is based on Jabber, so you can IM all of your friends on Gmail, Livejournal, etc.. just by adding them. They can add you via your bellsouth.net or att.net email address.
Another great feature: multi-protocol compatibility. You can add your Windows Live Messenger, AIM, and Yahoo! Messenger accounts and chat with your friends on those networks. While you can't recieve files, etc.. from those users, the 3 special features of AT&T Messenger are available to you with them, such as file sharing, photo sharing, and webcam.
AT&T provides 3 really cool features with their client: