[Q] Has anyone ever found an app like Nimbuzz/Palringo/Fring... that handles SMS?

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What I'm hoping to accomplish is getting an ALL-IN-ONE messaging client.

I can find tons like Palringo/Nimbuzz/IM+ that combine most of the important forms of instant messaging, and even ran across a few that try to mesh instant messaging with a proprietary SMS service (which fails because it revolves around a separate number).

...but there's something completely valuable that I cannot find; one app that can handle Facebook IM, GTalk IM, YIM, AIM... while integrating SMS into the same list.