More swapping

I found this great website for swapping books. It works like this: you list the books you no longer need on the website and for each book listed you get 1/10th of a point. Then if someone wants one of your books, you send it to them and that gives you more points (2 for sending within your own country, 3 for sending abroad). With these points, you can in turn 'buy' books from the website. Basically, for the price of postage and a book you no longer need, you get a book that you really really want. How cool is that!

The ironic hair-pulling tragedy here is that just over a year ago, I cleared all unwanted books from this house by bringing three large boxes of paperbacks to the local second-hand store. I got a couple of tenners for them. Now they would have been worth a goldmine... Still, I'm sure I can unearth some more unwanteds.

Now, do you know of any more websites like this one? For instance a website for swapping small hourglasses?