AIM in Gmail
With Google's Gmail you can now chat with friends that have an AIM account through the Google Talk interface. When you sign into your AIM account through Gmail, your AIM buddies will be populated in your Contact list. Of course you need an AIM account to use this feature.
To check to see if you have a lucky account (we're sure they'll be rolling this out to all users soon) logout, then log back into your account and click on Settings, from there visit the Chat tab and look at the bottom of the list for the section named AIM. Sign in, and your ready to go.
UPDATE; TIP: Make sure you are signed into Gmail chat in order for AIM chat to be activated.