Left 4 Dead De-Make
Eric Ruth Games has completed the NES De-Make of Left 4 Dead and posted it for download. After playing it, I'm hard pressed to imagine Nintendo doing any better. It's about as authentic as you could get. Don't stop there though, from the main page you will also find Mega Man Rocks and The Angry Video Game Nerd, both also in glorious 8-bit NES style.