AOL today made it possible to chat with AOL contacts across a variety of Google services: not just Gmail, but also iGoogle, Orkut, and Google Talk on Android phones.
If you chat with AIM buddies in Gmail, you'll notice a few changes:
First, you'll no longer need an AIM account to connect to your friends using AIM. Instead you'll be able to add your AIM buddies just like you add Gmail contacts to your chat list: using their AOL screennames (for example, email@example.com). AIM users will now also be able to add Google contacts to their AIM chat clients.
Second, you'll no longer be able to sign into your AIM account from within Gmail chat since you can now add AIM contacts directly. And lastly, if you previously had a lot of AIM contacts and don't want to re-add them to your chat list one by one, AOL has created a tool to import your AIM buddies into your Gmail account.
For more information, visit here.
[Via: Gmail blog]