Nice little utility from the makers of CCleaner and Defraggler.
Produces a report of the hardware in your machine with useful info such as HDD error rate, memory timings, temperatures, frequencies blah blah. Check it out if you're in touch with your inner geek
http://www.speccy.com/Edit: Oh yeah, it's still in beta so you may gut some erroneous readings (shows the two cores running at different speeds in my machine) but the full release won't be long.