Alot of people made new weapons/hats for Team Fortress 2, valve thought they were nice and putted them in the game. Everybody that made a weapon/hat that is now official in the game has bin awarded with a community item.
for more information check the blog, and if you wanne see the items check the movie

TF2 Blog : http://www.teamfortress.com/
Items Movie : http://www.youtube.com/watch?v=lPd8Usd0_gA

Posted by Freddy / AVB