Yeah, but who would make a game with a gameplay of 8 hours or more for a contest (besides some of the "program of the year"-contests)? I think a contest should focus on smaller things.

For games, everyone should be able to vote.
For programs, you can set up a value for each contest that indicates the winner.
Pixel art is difficult, but like in previous contest, you should focus on small stuff
Movies (if they should really express somethin) should be voted by all people plus a few judges. Then some kind of system could add the results together to receive the winner