Have an iPhone? Check out Trillian Astra

http://blog.ceruleanstudios.com/?p=162

Trillian Astra is a version of the popular Trillian IM client specifically designed for the iPhone (still no Trillian for the Mac tho).

So if you happen to have an iPhone and want some IM goodness, head on over to Cerulean Studios and signup to be an alpha tester.