I have so many, it's like I collect computers... Part of being a pack rat, I suppose.
Primary desktop at the moment: a Mac Mini (2013 1TB version)
Primary desktop back home: custom build AMD Phenom IIx6, what I nicknamed the "Aperture Science Time Waster" because of a Portal theme. Windows 7 ultimate, 8gb ram, GeForce GTX 560 with factory overclock, and a blu-ray drive (though since it came from an earlier HP build, no free software).
Primary laptop: a late 2008 black Macbook. I specifically sought out the black style, and had to replace the battery and adapter, and order Snow Leopard from Apple.
Former laptop: an HP POS. It was the first computer I bought solely on my own, and it turned out to have a horrible design flaw- no cooling except for the AC exhaust fan. The thing ran 80 degrees at idle.