I use Library Thing to organize my classroom library. After signing up for an account, I just added my books, and tagged them with topics I thought would be helpful. The accounts are free for up to 200 books, but I bought a lifetime membership for $25. I use the Library Thing bar code scanner to add my books (they cost $15), but books can be added manually if you choose. Personally, I think the scanner is well worth the money. Whenever I am looking for the books I have on a particular topic, I simply go to my tags page and click that tag. For example, if I need books that teach counting, I click that tag and I can see all of the books I have related to counting.
Find more Tech for Teachers ideas.
