I've talked about Paperback Swap before. Well, as of October 5th, they are going to reduce the initial credits you get just for signing up from three to two. It's still two books just for joining, but less than you would get if you signed up now. So, if you were on the fence about joining, go do it now and get the three credits.
Great for avid readers, readers on a budget, or readers looking for stuff that's out of print.