For the last few days, I've been in Denver hanging out with Alex King and working with him on the Wetpixel Photo of the Week (the code was mostly written by Alex, nearly two years ago). Here's what we did:
1. added public voting functionality to the existing POTW contest. the voting is constrained both by cookie and ip address to prevent fraud. if you go to the POTW site and vote, when you go back there using the same browser on the same computer, you will be able to change your vote.
2. created two POTW web widgets, one for the latest POTW and another that shows a specific user's latest entry.
Good stuff. Give the embedding a try, if you have a site that might benefit from pretty underwater pictures!