Ever wanted to create a catalog of all the books in your home? Well, believe it or not, there is a free online service named LibraryThing that makes it easy to do. Not only can you easily catalog your books, but you can also access your catalog from anywhere—even on your mobile phone. And because everyone catalogs together, LibraryThing also connects people with the same books, comes up with suggestions for what to read next, and so forth. Best of all, LibraryThing is a free service for libraries of up to 200 books, and for $10 a year of $25 for a lifetime, your catalog can have literally thousands of titles.

If you want it, LibraryThing is also an amazing social space, often described as "MySpace for books" or "Facebook for books." You can check out other people's libraries, see who has the most similar library to yours, swap reading suggestions and so forth. LibraryThing also makes book recommendations based on the collective intelligence of the other libraries.

For anyone who is a bibliophile, you've got to try LibraryThing.