Arch Linux, 64-Bit
It has taught me more about Linux in general than any other distro I have used ever has. I had to install xorg, then the interface, then my programs, yeah...loved it all. I got to make it my way. Gotta love these Vanilla Distros.
I run Openbox, Gnome3+Shell and KDE (Finally got Gnome-shell to stop autoloading in KDE, yay!)
I love openbox the most though, simplistic, extensively configurable, allows you to build it how you want, and takes up less than 200MB of my 4GB of RAM.
I have everything I need
Media Player: Banshee (Plus it works with iPods and that crap)
Media Ripping/Burning: K9Copy, DVD:rip, Brasero
Office Suite: Libreoffice 3.4
Graphics Editing: Gimp
Basic Text Editor: Gedit
Wine
Gaming: Emulators and whatnot, plus Steam...Steam works on it too, thanks to Wine!
Antivirus: ClamAV
I only run Windows inside of a VM when I really need it, and that's rare in occurance outside of my SQL class in college.
Best part is I don't have to pay jack squat for any of it, and it works just as good, if not better than Windows for me.
Otherwise once in awhile I'll be using Sabayon (Based on Gentoo), or Debian (Usually Testing or Sid)