The document discusses personal library tools that allow users to catalog, share, and find recommendations for their book collections online. It outlines four popular options - LibraryThing, GoodReads, Shelfari, and Google MyLibrary. For each option, it provides brief details on features like importing data from retailers, tagging books, reviewing books, and connecting with other readers. It encourages readers to create free accounts on the sites to explore adding books and customizing their profiles. The document aims to help readers determine which personal library tool may be the best fit based on their needs and interests.