I brine my chicken and use only salt, pepper and garlic powder in bleached flour to taste. I think this comes close to the Colonel's. Can anyone taste other spices in the original recipe?  
It's possible that the breading/spice mixture has been revealed, according to an article in the Chicago Tribune. They also provide a full recipe here, though as far as I can tell, the solid part is the spice mixture, and they're filling in the rest of the recipe.  They say it seems to be a good match... with the addition of MSG:     But more important, did it taste like the Colonel’s secret blend of herbs and spices? It came very close, yet something was still missing. That’s when a reporter grabbed a small container of the MSG flavor-enhancer Accent (how did that get in the test kitchen?) and sprinkled it on a piece of the fried chicken. That did the trick. Our chicken was virtually indistinguishable from the batch bought at KFC. (Does KFC add MSG? A KFC spokesperson confirms that it does use it in the Original Recipe chicken.)     The full story: a nephew of Colonel Sanders spoke with a reporter and showed him a recipe he claimed was the original recipe, then later downplayed it:     "That is the original 11 herbs and spices that were supposed to be so secretive," he says with conviction.      (In a subsequent phone interview with a Tribune editor, Ledington dialed back his certainty and expressed reluctance about sharing a recipe that — if it's legit — ranks among corporate America's most closely guarded secrets. "It could be; I don't know for sure," he said about the handwritten list of ingredients, adding that this was the first time he'd shown it to a reporter. "I've only had that album for four years, since my sister passed away.")   KFC's official responses were of a "neither confirm nor deny" flavor, so it's pretty hard to say if this is real or not, but it certainly could be. The clearest they said was:     "Lots of people through the years have claimed to discover or figure out the secret recipe, but no one's ever been right."   The handwritten recipe:    Transcribed:     11 Spices - Mix With 2 Cups White Fl.      1) 2/3 Ts salt   2) 1/2 Ts Thyme   3) 1/2 Ts Basil   4) 1/3 Ts Origino   5) 1 Ts Celery Salt   6) 1 Ts Black Pepper   7) 1 Ts Dried Mustard   8) 4 Ts Paprika   9) 2 Ts Garlic Salt   10) 1 Ts Ground Ginger   11) 3 Ts White Pepper    