If you're looking to test the stability of your BP6, Robert Redelmeier has written several programs packaged together as the CPU Burn package. cpuburn can be run to test the CPUs themselves. Note that if you're running a BP6 you probably want to run 2 copies of it to exercise both of the CPUs at once. burnBX is a general purpose RAM tester.
I encourage anyone who wants to report on their successes or failures to try these programs out.