I have been looking for ideas to use instead of a traditional guestbook. There are some I like, but I really like the idea of using a large photo frame with thick white matting and having people sign it with a super fine black marker. They can write anything they'd like or just sign their names. Then you can hang it on the wall with a pic from the wedding or whatever, instead of tucking it away like a guest book eventually does. But I've also heard of people using polaroid cameras to have a pic of every guest, but I think those of our camera shy guests wouldn't like that too much.