I have a Steam group called LPMT (Let's Play Minecraft and Terraria), and we makes videos and put them on Youtube.
I am recruiting members for a up-coming video contest to kinda celebrate the release of Minecraft in a few days! The contest will start AFTER the release of Minecraft, but feel free to submit content beforehand also!
The contest details will be posted on the Steam group profile, but it will probably be a building contest. Winner's will be decided by populat vote.