Cool book summary sites

Okay, so don't let your students know about these sites (I'm sure they do already as the internet age successors to Cliff Notes), but I've taken to reading through these book summaries to make sure that a book is worth my money or also for items that I have marginal interest in, but not enough to buy the book.

http://www.bookjive.com/wiki/Main_Page

http://wikisummaries.org/Main_Page