I've been working on ways to organize the books I have in my office. So far I've accounted for only about 275- yep and I'm not done. I have them organized, but I love using books for lots of topics. So while I might have one book in my "friendship" basket, it might also be perfect for conflict resolution or tolerance. So I love Shelfari, because it allows me to make multiple tags for the books. This means I can click on any topic and see all the books I have in my office that would relate. It's a great way for me to inventory and let other counselors know what books I own if they are in need.
Check it out: http://www.shelfari.com/