my gf's great too!
she's always encouraging me to play more, and has bought me gear for my birthdays and xmas.
she loves reading and has lots of different sorts of books, so whatever mood she's in, or whether she wants "chic lit" or a good ol' murder mystery, she's got exactly what she wants to read, and so understands why i "need" so many guitars and amps. how good's that?!!
oh, and she's recently started learning bass too!