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For Windows, Linux, etc a good disk benchmark problem is http://www.iozone.org/.
iozone -l 2 -u 2 -r 4k -s 100m -F /mnt/YOURDISK/f1 /mnt/YOURDISK/f2
If you don't have IOZone and want a quick and dirty sustained throughput report try the following:
dd if=/dev/sdX bs=64k
Open another terminal
iostat -m 2
For CPU burn-in I like to use the client from the distributed.net project. It simply tests the strength of encryption algorithms. Since it does so many floating point operations the CPU gets a very good test and an opportunity to reach its maximum temperature.
Another good one is HCI Design's MemTest which you can run from Windows.