Built my rig back in late 06 when the GeForce G80s were wiping the floor with the ATI cards. It was a beast back then... not so much now but I'm planning super duper upgrades by the end of the year
E6600 2.4Ghz/4MB L2 Cache + Thermalright Ultra 120
MSI P965 Neo
nVidia 8800GTS 640MB (G80)
2GB OCZ Platinum rev2 PC2-6400 (5-5-5-15)
HDD0: Seagate Barracuda 7200.9 320GB (ST3320620AS) 3.AAE
HDD1: Seagate Barracuda 7200.9 320GB (ST3320620AS) 3.AAE
HDD2: Seagate Barracuda 7200.11 1.5TB (ST31500341AS) CC1H
(Yes, that is 2.14TB of space. No RAID because i dont trust the RAID controller on the mobo lol)
NZXT PF500 500W
NZXT Lexa
ASUS PG191 + Creative T6100 5.1 Surround Sound
Logitech G15 + Logitech G9
Some stupid combinations in there you might think but i never really thought about 5.1 when I got the screen

. That, and the mobo. Stock speeds right now but I did OC the RAM+CPU a while back... didn't turn out so well with the mobo.
Games? Crysis, Crysis Warhead, World in Conflict + SA, GTA4. Those 4 are the most hardware taxing games.