Mozilla has publicized a lot of fun projects recently, the most recent being Mozilla Bespin.
It's nice too see so much efforts put into innovation, especially since it's based on open standards and open source software. It also makes the browser and the web itself more and more interesting which is a good reason for big web companies to support them (like Google's funding ((and also Microsoft's cooking ;) )) ). Anyway with so much openness also in the research projects, it must be fun to be a developper at Mozilla Labs.
On a side note, with the prospect of integrating Ubiquity into Bespin IDE , I guess I've been right to set Ubiquity's keybinding to Alt+x (aka M-x) right from the begining :D