Gigabyte GA-945GZM-S2 mainboard.
1.8Ghz Pentium Dual-Core E2160 - essentially a Core 2 with less cache. Awesome processor for the price.
1Gb PC2-5300, 533Mhz RAM.
256Mb Geforce 7600GT - I've achieved some serious overclocks with this card, from the stock 560 core and 700 memory, I've got it up to 680 core and 840 memory stable.
160Gb IDE hard drive (which I can replace with a faster SATA drive if you wish at the price of the parts).
15" IBM LCD.
DVDRW optical drive (can't remember the specs off the top of my head).
You'll need and speakers, keyboard and mouse. I've been playing CoD4 online with this for the last few weeks, as well as the SP game and have been getting great framerates, definitely admirable considering how nice CoD4 looks - also, all my Steam games get about 50fps at 1440x900 (on my own monitor), with HDR on, everything set to high, 2xAA, 16xAF.