I’ve already talked about using meebo’s web app, but now meebo has an iPhone client:
one app to rule them all
The Meebo native iPhone app. It’s fast, it’s pretty, and it just flat-out works. Available now for iPhone and iPod touch.
Like the web app, the iPhone client has an elegant interface and keeps you logged in and alerted to all your latest IMs. Now that they’ve got both the web and the iPhone covered, I can’t imagine using anything else for IM.