This GUI re-arranges the menu buttons to the coordinates like in Half-Life 2 and adds a logo. I also removed the group servers on the bottom of the menu. This also changes the PAUSE menu of the game!
How to Install: Go to your Steam folder in your Program Files or Program Files (x86) if you use 64 bits. Then install in steamapps/common/left4dead/left4dead/resource/UI/L4D360UI by extracting all of the files in this .zip file in it.
After that, start up the game and enjoy the awesome menu!