Uploadourday.co.uk is a great idea. Like other sites, there’s a gallery to which all your guests can upload their digital photos of the big day, but Upload Our Day offers even more.
You get cards with the details of the site (you can send these out with the invitations), then you get table cards as a reminder on the day, and then you get even more reminder cards to send out with your thank you cards. Finally, once your guests have uploaded all their pics, you get a DVD of everyone’s photos. It doesn’t come cheap, at £99.95 for the Classic Pack (which includes all of the above), but it’s probably not much more expensive than buying disposable cameras.