I have a lot of older paperbacks that aren't worth enough individually to ebay, aren't desired by my local used book shop, and are still too good to just recycle as paper.
I've tried setting up a book sale or book swap here on the island with not much success. So I'm quite intrigued by this project to unite books with people that want them. They have more than a million books available, with about 500 to 800 being added every hour. I'm sure there's some amount being taken out the system as well, but I didn't run across that number yet.
I put in a completely random bag full of entries, and had two matches to things people were looking for. My only concern is that listing books that no one speaks for means that I'll be committed to having them on hand and available for a really long time. Or, at least, until I delete the lists again. meanwhile, maybe some books will find good homes.