I've only got three machines at home, so it's "my computer", "my g/f's computer", and "my linux box". My brother's a bit more creative, naming his machines after body parts: spleen, colon, pancreas, etc.
Personally, I like Rotten's naming: poetry, vatican, wtf, janetreno, etc.. (not intended to make any real sense, other than to make you go "huh?" when you see them..)