I just installed my watercooling today.
however, today has been a VERY hot day. There was even a building on fire today close to where I live. A very big fire, too.
My CPU is idling at about 28-30ºC (watercooled), and my 8800 GT is idling at about 68ºC (stock cooling)
I think I'll wait until it's the middle of the night, then do another overclocking run.