1 - Domain Controller
1 - File/print server/alternate DC
1 - "Copying station", has 2 DVD RW's, cassette deck (for covnerting my '80s tapes to MP3), video input (for converting VHS/video to DVD), scaner, etc.
1 - Test computer for testing new software, also for when I go to sites I know will give me unwanted spyware or viruses. Right now it's running Ubuntu.
(all four of those are on my "server rack" with a 4-port KVM)
4 - Tower PC's, one for each member of the family
2 - Laptops, one each for my wife and I
1 - Game PC for my sons' friends to play network games with my kids
1 - Garage laptop