Photobooths are becoming an increasingly popular addition to weddings, and it's easy to see why. Guests have usually spent all day with a photographer (usually trying to avoid them at all costs!) and then as soon as they're in charge, they flood to the photobooth!
All joking aside, there are many aspects to photobooths that makes them a great idea. To start with, most photographers will finish within around half an hour of the first dance, meaning (depending on what time the first dance is) you might have 4 or 5 hours of party/mayhem that otherwise goes undocumented.
A lot of my recent clients have had a photobooth where the bride and groom get a second copy printed which gets stuck in a guest book - a great way of getting your guests to sign the guest book and leave a message at the same time.