Google just unleashed an IM program similar to AIM.
It's not officially out yet, but I stumbled across the site (kept refreshing over and over again at midnight until it finally came up, then i clicked download immediately trying to be number 1, lol).
It's not linked to from anywhere yet, google hasn't officially released it yet, but it's there and works. Expect the announcement in the next half hour probably.
My name on there is email@example.com