Pretty much exactly the one here (http://www.geocities.com/bourbonstreet/3220/servobasics.html), but with a photoresistor from pin 7 to R2, and the resistor and capacitor values tweaked to use a 50K pot. Nothing very advanced at all, really. Anything more and I'd want to flee to the safety of a microcontroller. (Like, I wish I could easily add a microphone and have it pulse to maximum opacity for a second or two after a loud noise -- peril-sensitive sunglasses! But doing that in parallel with everything else in circuitry? Not going to happen.)
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