Something really nifty...

You know how some people plant "treasure" for scavenger hunters to find using coordinates on a website? A similar concept for book lovers is BookCrossing.com. You read a book, label it with a note you can print from the website, maybe write a review, and then leave it in some spot/donate it/etc. so that someone will find it and read it. That person then reads it and adds to the reviews. It's sort of making the world itself a giant library. Check it out.