Dover Public Library has put together a really interesting Wiki called The Rabid Reader. It includes pages about books that someone liked and created a page about. The pages can be commented on -- did you also like the book, did you not, etc. -- or you can add your own page about a book that isn't listed yet. There are also a couple of "If you liked this book, try these" pages which were interesting, although some insight into what the poster felt made Janet Evanovich a read-alike for Carl Hiaasen would have been good.
I thought this was an excellent use of technology to provide a venue for talking about books!