AOL's AIM [App Store] has been updated to version 2.0.1, bringing several new features, as well as a change to an ad-supported model for the free edition. AOL also promises that an ad-free paid version is currently working its way through Apple's approval process and should be available soon.
Among the new features available in AIM are tools to access contacts directly from within the application, configure multiple screen names and easily switch between them, and share locations with buddies to find nearby friends. In order to work around Apple's limitations on applications running in the background AIM has also developed a system to allow users to stay logged in for up to 24 hours, even when the application is not open. Users can then receive notification of incoming messages via SMS.