Spinfree has announced that Singlefile Books, a Web-based service that allows users to keep track of their own personal book library, has officially replaced its BookBin book collection organizing software. Singlefile is Web-based, so users can access their collections from anywhere in the world using a Web browser. Singlefile is free for collections of up to 25 books, US$19.95 a year for up to 500 books, and $39.95 a year for an unlimited books in the collection.