eBuddy 4

So far I've found eBuddy to be a better chat application than the ones you have to pay for. It uses push notifications to update you of an IM and gives you the option to stay signed in for up to 30 minutes after you've closed the application down. It supports connecting to MSN, Yahoo, ICQ, Google Talk, AIM and Facebook.

It's quite a simple app, but sometimes simplicity is king.