SpeedFan is great too and lets you monitor fan speeds, control fans, and set up Alerts or emails regarding temps, fan speeds, etc. (great for computers that are left running and not monitored by a person)
Don't mean to thread jack but I have a quick question too...HWmonitor also shows CPU power usage, and my unlocked phenom II x4 b55 runs at 158 watts when under load...isn't this WAY to high??