http://www.youtube.com/watch?v=Y8bsE...eature=related

You get these weapons in Team Fortress 2 if you preorder.

http://www.youtube.com/watch?v=vmVYuh9JL8Q

You get this hat by entering a code given to those that obtain the Riftwalker achievement in Team Fortress 2.

Quite odd to cross these two games together.