I've pimped out my current system with the following (I was inspired by Linux but I don't feel a need to switch off of windows).
1. WinHotKey (a BOSS program that allows you to easily hotkey your system to so that you can run programs, open folders, or even type specific text all with a few key strokes.
2. Virtuawin (an excellent program that allows you to have multiple desktops with multiple programs on each running)
3. Sixaxis, ControlMK, Winrar (with these I'm able to operate my computer using a ps3 controller. And I can play any game with it also)
4. Emulators (with these I'm able to play nes, snes, gb, gbc, gba, gc, ps, ps2, or even x-box games. Of course I don't though, because to have the files for the games and bioses is illegal ;-)
So how do you pimp out you computer?