The L4D mapping kit was released recently. We can now make maps for L4D without going through the painful proccess of setting it up with the original Source SDK.

Go into your tools just as if you were installing Source SDK, and install "L4D Authoring Tools Beta".

I know I am not the only one who has been waiting for this, so that is the reason for me posting. To those who are relieved it's released, have fun!