I just recently found out that it is possible to mod the main menu for Left 4 Dead in a way that is so easy, a caveman could understand it.
Here's a personal favorite of mine that I did not make:
http://www.youtube.com/watch?v=1MYoYxF6pkY
Here's one that I made:
http://www.youtube.com/watch?v=TxSXNqN7xRg
Unfortunately, I'm having some issues with the music on that one. Pretty fun stuff, though.
