For reference, two lengthy discussions/sharing sessions on the topic:

http://serverfault.com/questions/45734/the-coolest-server-na...

http://discuss.fogcreek.com/joelonsoftware/default.asp?cmd=s...

I use major road names myself (e.g. ventura, victory, sherman).

Bridges from here: http://bridgehunter.com/ - Space Satellites from here: http://www.jpl.nasa.gov/missions/

- soft drinks (if you have paired servers or backups, one can be "diet".)

- characters from a specific cartoon or kids show (we used Simpsons; Muppets is also popular)

- local geographic landmarks (islands, lakes, mountains, etc.)

We go with marvel comic book characters. We started with the normal ones, but somehow ended up with an important service named uatu. I like this naming convention because there are a lot of names to draw from.

I'll start off: Calvin and Hobbes.

We had to add a third...so it was named Locke.