I have plenty of computers... let's see...
PB G4 is 'fusion'
Athlon64 box's Linux install is 'wavefront' (as in alias|wavefront, makers of the only software used on there)
Athlon64 box's Win2k install will be 'lager' (have to reinstall)
Sun Ultra Enterprise 3000 is, creatively enough, 'enterprise'. Or 'unknown', depending on whether or not Solaris feels like setting the hostname properly at boot...
I've seen all sorts of naming conventions. Some that come to mind:
The DB servers at a company I know are named 'bambi', 'thumper', etc
The CSDE at U of WA names their servers (Sun machines, of course) 'leo', 'polaris', and so on
I'm setting up a cluster of computers to do some distributed 3d rendering and decided on a naming strategy (other than making it up as I go) - The head node is 'Panthera', and the cluster nodes are 'Tigris', 'Leo', and so on (I'll look up more of the major species subsets if I can afford more than 3 nodes

)
my WAP's SSID is reason. Homage to the greatest music software ever, Reason 2.5 by Propellerhead Software