I don't remember how I found out about the Kindle Lending Club but I figured I'd pass along the information. In theory, a good idea, but it does have its limitations. First of all, you can only lend a book once. That isn't a terrible problem. However, nobody is looking to borrow any of the books I have on my Kindle. Even if they were, every book I have put up to lend is not lendable, because they are too good or too recent and Amazon has not released them for lending.
The big problem for me is finding a book that I actually want to read. Here are a few of the books people have to lend.
So if you have nothing else to do, go browse the selections and amuse yourself. I am going to attack some items on my "to-do" list and for the moment, joining this Kindle club is not one of them. Let me know if you have any better luck than I did - LOL.