I've found a new hobby: Library Thing. It was mentioned on a Buffy fan board I frequent (mostly in lurker mode). It is so cool. You can catalog your books and share your library with people. I promise to share mine (and Icepick's because I'm not about to try to separate our books) as soon as I have it done.
In the meantime, maybe you'll want to give it a try. I'll be back when (if) I'm done.
Update: Nowhere near done, but I have catalogued just over 300 books (four small sets of shelves) so far. I still have nine or ten sets of (larger) shelves to go. This project is way more fun than cleaning house or organizing paperwork. You can see our list here.