for the company computers we do COMPANY ABBREVIATION-DEPARTMENT#number(-LT if mobile workstation). has worked out nicely so far but we are a small operation. for home, i use Iron Man characters. I like to name my main gaming PC as villains, like Iron Monger. I am a HUGE Spider-Man fan, but I admit I don't think it is as cool to see Doc Ock or Kraven as opposed to... War Machine... light up on the network.
*edit - Monger not Mongrel