What the USB naysayers haven't said though is
exactly why USB is not
 suitable for keyboards and mice. 
Yes I have.
 As for me, none of the three machines here have a PS/2 port for kb's or mice
 - and no loss either - I can plug those into wherever I want rather than
 being forced to locate them to the back of the machines. The other thing 
Eh> If you want PS/2 poerts on the front of the machine, it's triviel to
make up extension leads.
Having a host that will accept a keyboard on the USB poer is OK,. You cna
get cheap interface connverters to use PS/2 keyboards (and mice)/. The
problem comes when you have a host that has only a PS/2 port and you find
that PS/2 keyboartds are no longer made....
  too, is I only need one of each for all three boxes
and can swap them whener
 I want. PS/2 interfaces don't fare quite so well when the machine is on. 
I've nmever had any problems hot-swappign PS/2 dvices. It's not
recomended, but....
-tony