I got this idea from The Knot and it was a highlight of my reception. A lot of people talking about it and enjoying the service. We used Party Booths but I would imagine any photo booth vendor would do the trick. Party Booths was outstanding: great set-up, friendly person on hand, beautiful prints. One word of advice if you use a different vendor: don't use an open format (one where other guests can see people as their photos are taken. Some of your guests won't let their hair down. Use one that's like a booth with a curtain. Also, to ensure the best, and more fun photos, don't have the vendor show photos on a big screen; if people know their photos will be displayed, they'll censor themselves. Great fun.