I did end up writing a lot of GreaseMonkey Scripts for meebo, that are available on userscripts.org. It was the same time that I was poking around with Adobe Apollo. So here is the idea. I am planning to convert Meebo to a desktop application using Apollo. An important feature that I am looking at something like pluggable GreaseMonkey emulator that will let people write plugins for meebo. That will sure give rise to a lot of mash ups.
Still exploring the idea....