ANother thought - Speedfan also will show you what SMART data looks like on your hard drive and it will also show you if you CPU temps are too high, etc -
http://www.almico.com/speedfan.php
With speedfan you can also look at voltages to see how close your PSU is to the proper voltages. Of course, this is your motherboard monitoring going on here and it is not entirely accurate at showing you voltages, so all you should care about is that they are close, though not neccesarily exact. If you voltages are off by say several 10ths of a volt, then you should think about buying a PSU tester.
-S