How do I check video card temperature?

How do I check what my temperature of my 2600XT video card is? Im running Windows Vista, and I tried ATI TOOLS for vista(beta), but I cant seem to get it to work. Something about unverified drivers, and kernel something isnt running.|||download speedfan. just google it. this program will tell you the temperature of your video card, cpu, ambient (temp inside your computer case), temperature per core (if you have a multi-core system). very useful to have.