For those still looking for a free Instant Messaging alternative to AOL's AIM [Free, App Store] and Twenty08's MobileChat [$2.99, App Store] should take a look at Palringo [Free, App Store].
The application has just been updated to version 1.1 and offers compatibility with multiple service providers including:
- Google Talk
- Yahoo! Messenger
- Gadu Gadu
- Windows Live Messenger
One minor disadvantage with Palringo is the need to create a Palringo specific login in order to use the application. Forum user trunksu has posted a FAQ detailing some of the differences between the apps.