You sign up, enter the name of a book, then find out what other folks who liked that book also liked; a tag cloud for the book leads to other books on this topic. Quite addictive, and I just used it to look at the info. around one book.
major site for alternative experimental film/video; "Here you will find films and videos that transgress the boundaries of the traditional viewing experience, challenge notions of physical perception and provide cutting edge alternatives to the media info
This study draws on the observations of five instructional designers who discuss their professional identities, their communities of practice and their roles as agents of social and institutional change.