I use RivaTuner to set up fan profiles for my 8600GT. While the active display for temperatures is not continually displayed on the taskbar (because Microsoft thought it was a good idea to automatically hide it even though I specifically tell it not to), it is operating. It only displays when I have RivaTuner open.
Who makes your 8800? I would suggest Evga Precision as that is what I used when I had my 9600GT, but that's for only Evga cards, I believe. Possibly Nvidia System Tools.