OMG -- there's an application on Facebook that allows you to add a Visual Bookshelf to your wall (the message space on your profile page is actually called a wall). There are a few categories you can add, including books bought, read, and want to read. You type in the title, and it auto-generates a thumbnail of the cover. It's pretty cool. I am so tempted, but I think the limit for each section is about 100.

I'm also not sure how I feel about having an actual visual representation of my addiction.