ATITool is such a great tool it almost makes me want to wait for R600 cards to release, because it worked SO well with my X800XL back in the day...
with my 7900GT it still kinda works - I get temp reporting and I can set the clock speeds and I can have it kick up the fan into high gear for 3D, BUT you can't actually have it dynamically adjust the fan speed with temperature like it can for ATI cards... I'm hoping either the 8800 series allows for that and ATITool features it like it does for ATI cards, or that the R600 is price and performance competitive with the 8800s...