I'll throw in a "me too" for Ubuntu. I prefer pure Debian actually, but Ubuntu is like "Totally Painless Ultra Sexy Debian". To give an idea of how well it works, it automagically configured all the power management stuff on my laptop correctly. Out of the box. This can be a somewhat arduous task by hand, depending heavily on the laptop. So, I use it on my laptop :-)
If you flip back and decide to stay with Windows, yet another "me too" for Firefox...
