I had two power supplies die within 6 hours of each other last week. The strange thing is that the machines had nothing in common (except OS). They were different ages, different MB manufacturers, different PSU makes and about 6km away from each other.
Thankfully, only two decided to give up the ghost ... so everything is now fixed and running again.
The 26 million cobblestone mark went trundling by sometime yesterday. My 'ol Nvidia 9800GT is still delivering some useful credit on PrimeGrid :-)