Despite the limitations of the "hacked" SDK for Left 4 Dead there are some great looking mods such as Dead Before Dawn.
It seems that the official SDK will be needed for some of the map scripting and for fixing a couple of textures but otherwise this mod is looking very polished!
The environment looks well designed and there is obviously a back story too, which is nice.
Between Anna's house, the Gas Station and the Town there looks like there is plenty to do! Obviously some more work is still to be done but I can't wait to play it! Great work!