Developed one of the coolest extensions I have seen in awhile: Get your facebook wall in Buzz style inside your gmail. Its a chrome extension, which I will soon port into firefox through greasemonkey, you can find it over here: chrome.google.com/extensions/d ...

Presentation: docs.google.com/present/view?i ...
Screenshot: chrome.google.com/extensions/i ...

(In retrospect, the first sentence is really narcissistic... but I really love this extension for some reason)

It's interesting, does it display the top news or most recent?

Most recent, and it got featured on techcrunch as well (techcrunch.com/2010/02/16/anno ...), only problem is that it functions only in approx. 70% of the cases, as not everybody's gmail is the same (different labs and I suspect there is even more variation).

That's nice!
I like it very much, I have some problems but it looks promising.

Nice! Have you looked into the Gmail Greasemonkey API for this? It should be a relatively stable API for modifying the Gmail interface with user scripts.

code.google.com/p/gmail-grease ...