Do your LIBRARY thing!

Thanks to Learning 2.0, I am now a member of LibraryThing. I added the required five books to my catalog. But I'm not sure I'll be using this Web 2.0 tool in the future. I don't know how it could be useful to me. If I want to know what books I have, I can just walk to my bookcase and look at them. My collection is not that extensive...I work for a library, after all! Why buy books when I can check them out?!