If you're an avid buyer of books on web sites like Amazon, Barnes and Noble, Powell's or any other online bookseller, you might be interested in a small gadget created by New Hampshire web guru, Jon Udell. It doesn't cost a penny and what it lets you do is check quickly to see if your local library has a copy of a book you might have thought of buying. Udell hopes his little invention not only might save you money, it might bring you just a little bit closer to your neighbors.