I am getting married quite soon and wanted to have a photo booth for the reception, so I decided that CHDK was the way to go. Here is what I made:
photoboop.comBasically you turn on "remote" and the Arduino handles the rest!
If you install an Eye-Fi (a little fidgety with CHDK, I know), you can also automatically upload pics to a photo sharing website.
It's available as a kit on Kickstarter (look for Photoboop Box kit):
http://bit.ly/photoboopWhat do you guys think?