Trisquel 4.1 LTS, a fully free GNU/Linux distribution with no proprietary components whatsoever. No proprietary drivers, no proprietary blobs in the Linux kernel, includes a fully free version of Flash Player (Gnash), and I have full hardware 3D support with Compiz enabled.
This version of GNU/Linux frowns upon just about every other distribution out there, due to including proprietary components. The only other one it can't frown upon is gNewSense, which is another fully-free GNU/Linux distribution.