We did just this. It worked out wonderfully. 200 disposable cameras (hey, it was 1999), 27 pictures each. This is a @#$%load of photos folks. 90% of them were total crap. 7% of them were way-cool novelties, 3% of them were pure gold that no wedding photographer could have captured. We had a traditional wedding potog take the usual pictures that no one looks at as well.

Pictures were taken at the wedding, the reception, and the after-party. At the end of it all, we mailed out cd-roms of the best pictures to everyone who attended. (These cd's had, incidentally, also been the invitations. Bring your invitation along, get photos of the event!)

I highly recommend it to one and all. Crowd-sourced photos rock.