I've been known to buy way too many books so the best thing to do is pass them along to other readers. My favorite way to do this is to give books away to friends and guests when they leave our house. I keep just my favorite books, and the ones I know I will read again. The others must find new homes. We have frequent parties with our friends, so it's easy to keep passing out books. But when the shelf over-flows, BookCrossing is the way to go.