I'll chime one in for the death of floppy disks. About a year ago, I got a brand spanking new Promise SATA disk controller, and all the drivers were sent on a floppy disk. The last time I actually tried to use my floppy drive, it managed to short itself out. The power wires connected to it quickly became hot enough to burn through the insulation. So I'm a little wary of hooking up any of the old floppy drives I have laying around, even for SATA. Good thing Promise has a nice online archive of their drivers.

(I leave a floppy drive in the case, just because I don't have a cover for my 3.5" bay and need something there to keep the dust out. But it's not hooked up.)