All I did was run the 32-bit free GeekBench 2.1, and ran it against all the big numbers. I wanted to make sure mine was performing on par. It's actually even a bit better

The other thing you can do is get gfxcardstatus. I've noticed a couple of things that can make my computer idle hot:
1) Chrome 10. It calls the non-integrated (discrete) GPU into action whenever you open your first Flash web page, and never puts it back to sleep thereafter, until Chrome quit. Google is aware of this and I believe is going to try to fix it for the next update.
2) Any old PowerPC apps, like my MSWord 2004, seem to do the same GPU callup. Very weird. Even when I quit Microsoft, I guess somehow an autoupdater client in Rosetta stays open unless I forcequit it.
Either way, GFXCardStatus is neat, cuz u can see which card your computer is working on at any time, and force it to pick one or the other.