I just upgraded mine before Xmas.

Old:
AMD Athlon 64 3600+
1 GB PC3200 Ram
ATI 2600XT HD Vid card
ASUS mobo

New:
Intel Q6700 OC'd to 3.52 GHz
4 GB RAM (OCZ-SLI)
Geforce GTX 260 core216
750i FTW SLI Mobo
(still running XP tho, hoping to upgrade to either vista or Windows 7 soon)

Still have old hard drive, optical drives and other accessorities... I love my CPU coolor for my 6700 tho... Thermaltake DuOrb (not the vga cooler) Keeps my temps down to low 50's under load air cooled.