I know that the Imagio came with a default application with MSN, Yahoo and AIM. However, I didn't like them all that much. They were a little bugy to me and I got charged for the IM's. But now, no longer.
I have Google Chat, AIM, MSN, Yahoo all running and running VERY!!! well. The application is called Palringo. Uses MINIMAL memory, FAR!!! less then default application, and it incorporates Google Maps/Latitude.
Give it a try if you're wanting something new/better.
http://www.palringo.com/en/us/download/
Bryan