Local Best Buy is selling their floor models dirt cheap.
Picked up a Dell Inspiron 530
Core 2 Quad Q6600
640GB SATA hard drive
16x DVD burner
Intel GMA 3100 integrated graphics
Lots (8 I think) of USB 2.0 ports, 1394a port, card reader
Vista Home Premium (soon to be formatted over with XP Pro/SP3) heh
No monitor, CDs, etc. Just the main unit, keyboard, mouse, and power cord.
Bought a Radeon HT 2400 Pro for $37 (it was being discontinued) to use in place of the integrated graphics.