One of my bridal mags suggested that instead of a guest book, guests leave notes for the couple on little cards that have just enough text to get them started. So, instead of being faced with a blank card, the guest can finish off a sentence.
For example, "You know you're in love when..." or "I'll always remember when..."
I love this because I think it puts less pressure on the guests (I hate feeling like I have to instantly think of something witty) and because I think people will say more interesting things.
I'd rather have a book than a bunch of cards though, so I was planning to get rubber stamps made that would have those opening lines, so people could stamp the book and write their message. I was about to hit "order" when I panicked that the ink pads would be an accident waiting to happen. We won't have too many kids at our wedding, but still...an open ink pad in a place where people will be wearing dressed up might be dangerous, no?
Anyway, please let me know if I'm overthinking this!