I broke down and bought a 6000 BTU air conditioner last week - mounted it in the window next to the main system, and ran a 4" dryer vent duct from the upper outlet of the A/C to the front intake fan of the tower . . .
Since I've slipped over to the "Dark Side", and I'll be swapping in a KK-266-R mobo with a 1.2 Ghz AXIA T-Bird, I justified the $190 as an "overclocking accessory" . . .
Peltier and a water block system would've been cheaper, tho' . . .