But you are everything else you own (sorry, Tyler Durden). A few months ago, I sang the praises of DVDSpot. Recently, I discovered a new site: MediaChest. There you can catalog not just your DVDs, but also your books, videogames, and CDs. I was really digging the site until I realized that it may have been abandoned (no CDs from 2005 and late 2004 are in the database; no posts from the admins since October '04). Oh, well.
Anyway, here's my profile there, albeit incomplete. (There are a few hundred CDs, as well as some books, DVDs, and games not listed).
Mad props to the law fairy who had a similar post, but trust me: I thought of it first.