This is an amazing concept!! this is the way it should be... books are to be shared around, for everyone to be able to have the experience of reading something great like you did... I find it such a waste to buy books... I always get given them, or swap them.. the only time I do buy them, is upon a random recomendation from someone random, as I believe that they tend to come around in your life when just what you need to do is to pick up that book!
To be able to follow your book around the world too is great!! Im excited about this site, and Im gonna go hunt!!! hehehehe