Geez! It took longer to write about making this change than to actually do the work!
I swapped an NVIDIA Gforce 256M graphics card that had a small heat sink for an NVIDIA Gforce 2G card with a large fan, changed a 350G internal hard drive for a 500G (I've got 5 terabytes of external drives. Didn't need to spend the money for an big internal one, and added another auxilliary fan just to cool everything down even further. Right now there are SIX fans cooling the tower. That should keep things alive a bit longer...