An Interesting Web Book "App"

What reminds you of what?  When one reads -- or hears about -- a book, one almost unconsciously make connections -- this book is a little bit like that book.  When you tell someone you are interested in some topic s/he will often say, "well, then you should have a look at ...." 

Now there is a web resource, http://www.librarything.com/, that implements this as a combination of a personal library catalog and a social network.  It allows you, virtually, to surf your own library and connect from books you know to books that are related to it.

When I played around with it looking for books on the sociology of information I got a bookshelf that nearly mirrored my collection in this area, but with a few titles I was unfamiliar with thrown in: