Cool idea, but Tux with Valve in the head would be better
Why not Tuxified and, little a tapped? Tux the progenitor of tuxification upon the world!
Or not. Still, a tapped tux would definately be a sweet, and winky (not really winky, just damn cool) moment when you start a Valve-release in Linux and there's the back of Tux' head, releasing steam from his valve. Maybe give him a Gordon-stache and shooting Devils when Half-Life turns up.
Lolz. Yeah, Tux as a mascot has always been a benefit. So versatile.
I hope my Windows License of L4D2 will work with that, but even then... I might consider spending money on it (again). Well, I still dislike Steam for DRM and this kind of stuff (community part is ok though) but if that really comes true... wow.