The contest is themed around the in-game UI, which covers the Health, Ammo, Killstreaks and so on. Basically, everything you see while playing the game.
Now, no contest is worth doing without prizes. You all want something for contributing, I'm sure of it. Let's do that then. But while we do that, let's explain how to get involved.
If you want to get fully involved in the contest, all you need to do is design and implement a working HUD in TF2 by May 31st. The full specifics can be found on the huds.tf thread[huds.tf]. After the cut off date, an open, community vote will be running, in which, as the name suggests, the community will vote on their favorite submission.
The first place winner will receive 15 keys! Second place receives 10 keys Third place receives 5 keys That's a decent payout if I may say so myself.
But that's not it! Voters get a chance to win too! By voting, you are automatically entered into a raffle to win 5 keys. Winning for doing nothing except voting for a nice looking HUD? What a world.
Everything else you need to know is on the huds.tf thread[huds.tf]. You can sign up to the forums using Steam, so it's not too much hassle to get yourselves involved.