Lately, I've been using a Toshiba Satellite A210, which I found in an e-recycling pile about a year ago. Amazingly, most of it was intact, it just needed a power cord, a hard drive, and some ram. The screen even works perfectly! No battery though, but that doesn't matter to me since I'm usually in close proximity to a power outlet anyway, and I've found actually carrying a laptop while using it to be quite impractical.
Anyway, mine has 2GB of ram, a 1.9GHz mobile Athlon 64x2, and Radeon X1200 series graphics, as well as a 320GB hard drive, culled from my decommissioned Alienware laptop. It's alright for Windows 7, but it seems to be more comfortable in Linux... except when it comes to running games. Not that it's much good for that in Windows... XD