My warhorse mac is over six years old and still chugging along. I'm expanding the mac with a bigger external hard drive and a better DVD burner, but I have to install a USB 2.0 card to upgrade. I've never installed a PCI card before and it turned out to be pretty easy. No drivers or nuthin'. The hardest part was getting all the dust out from inside the mac, that was three-fourths of the time. For those with older computers, blow the dust out of them every six months or so. I must have aired out a pound of dust, all sucked in by the fan system. Anyway, here's some photos: