Replaced my rig about, oh, 5 months ago. Quad core 955BE, 8gig dominator ram, 1gig asus 4890, Windows 7, some other stuff i don't particularly know or care about. As long as it's fast and doesnt break.
I think my oldest piece of equipment right now is my G15 keyboard. Man, Logitech knows how to make quality peripherals. Bought this thing about, oh, 3 years ago. Have, since then, bought 2 or 3 'gaming' keyboards to replace it but always ended up plugging the ol Logitech back in. It just works, and seems to be constructed out of the same stuff they make black boxes from.