Heh, you do know that you can just press ALT for the colour picker, and that doing undo is unnecessary in that case, except when you set the pixel on a different layer? It won't have any transparency to it I guess this is more fancy than my old AA-colourfinder http://omr.planet-d.net/trash/aac.zip
he means that you can be using the pencil tool, and hold down the alt key while still on pencil to temporarily switch to the eye dropper. this is a big helper for speed!
good work goboomi just dont get how it works!
You simply take your 2 RGB values and enter them in, and blamo! out comes your perfect 50% AA color.