A few weeks ago I blogged about moving my development machine to Ubuntu. So far so good, but here is what I've noticed so far as a developer:
apt-get source foo is the best command in the world when playing with packages
Fedora configured my X with a very small xorg.conf. Ubuntu's default xorg.conf is HUUUGE and bloated on this new install. Congrats to the Redhat guys that made this possible. Ubuntu guys, please start doing the same.
Also on related X news, I'm very suprised at the lack of noise about open source NVidia driver effort. It seems to me that 5 talented X hackers using renouveau could probably do a half decent OpenGL driver in a couple of weeks. Even if the driver wasn't complete, a driver that would work for 90% of typical use scenarios would be great. Or even better, if renouveau could be made point and click so that 500 semi-talented hackers could do it in a few months.
After looking at the TODO page I've decided my code-karma is probably lacking for X and DRI work, although I'm doing lots of background reading to try and do something useful in a few months, and if nothing else, I can help improve the documentation.