I have a pic rating script and a vid rating script that I wrote (almost) from scratch that I can setup for you real cheap or maybe even trade for some traffic to my sites. I can easily dress these scripts up to fit your site, just let me know what you want...
Check out both scripts at:
http://www.takemygirlfriendplease.com/picture-rating
http://www.takemygirlfriendplease.com/video-rating