1) Read a good book (you already know how to do that)
2) Register it here (along with your journal comments), get a unique BCID (BookCrossing ID number), and label the book
3) Release it for someone else to read (give it to a friend, leave it on a park bench, donate it to charity, “forget” it in a coffee shop, etc.), and get notified by email each time someone comes here and records journal entries for that book.
The idea is to construct a category of itinerant books that move from reader to reader, to follow the interesting places those books go, and to see what conversations those “wild and free” books can stimulate. (Xeni Jardin talks about another category of sites that mix of auction, social software, and peer to peer in the latest Wired.)
An interesting idea, and a neat way to get rid of those extra copies of books that you liked at one time but aren’t doing anything but taking up space on your bookshelf.