Like ED said, if you have a top spec PC then 3DMark2005 & 2006 from futuremark.com are very good.
They also do PCMark which will test your whole system.
For component specific benchmarks there is software such as HDTach for your hard drives and memtest for your RAM (less a benchmark, more a diagnostic).
You can also have a look for SuperPi and Prime95 - both are good at stressing your system and seeing how it is running.
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