Water cooled P4 775 3GHZ overclocked to 3.5GHZ 35c, Video card is also water cooled running at 43c dual monitor and Digital TV card in use most of the time.
The video card is on the output of the CPU water system, so it's a little high.
Vapor Phase is my next "pimp my machine" venture, when I stop spending money on flights.
http://www.pccasegear.com.au/prod3114.htm