I have a desktop for gaming, watching HD video, and general use. 2.66 GHz Core 2 Quad with 6 gigs of RAM (64bit vista), GeForce 9600, average sound card. 22 inch LCD monitor that I bought for the price rather than the resolution (clarity is great, it just can't get past 1680x1050).

I also have an ultraportable laptop. ThinkPad (because I loathe trackpads and it only has the nub) with a 2.20 Core 2 Duo, no optical drives, and an integrated video card, and a 12.1" screen. I works, it could use another stick of RAM (bought it with one DIMM, forgot to get another gig stick). Battery life is pretty good, and I'll probably upgrade to Windows 7 using an external drive when that comes out (currently has XP).