After years of neglect, AOL has apparently remembered that Windows Mobile exists and just released a new official AIM client. Though still in beta, it's supposedly compatible with all WinMo 5 and 6 devices. It looks pretty swank, at least as far as WinMo apps go, and more than satisfying for a mobile AIM client. Hopefully this means they're cooking up one for the iPhone too. [AOL via XDA Developers via BGR]
@Git Em SteveDave has a crush on the Swedes: Why the hell would you want AIM, when iChat, Adium and so forth work just fine? I'm an Adium person myself, and I'll probably never go back to iChat.
But, IF you're really looking for something from AOL directly, AOL's UB application is actually very light on the resources when it's running, so you can just close the web browser window and you have your AIM. I don't see much difference.