Ok, I pulled em, marked each one (#1 cylinder closest to timing belt, and so on), and each spark plug looks different. I don't have digital pictures yet, but here's a very brief description:

#1: thin coat of grey ashy lookin stuff covering electrode, ground prong, insulator, and metal rim. The V-notch in the electrode is stil visible (NGK V-power plugs).

#2: Thin coat of the same grey ashy stuff on the electrode, ground prong and insulator. But, the metal rim is covered in what I think is oil and carbon. It's not caked on, but it's an even layer of very black moist stuff. V-notch is almost worn flat.

#3: looks the worst of the three, the ash is white, not gray, and it's thick. Very thick caked-on black dry stuff around the metal rim, and again the V-notch is almost gone.

#4: Ash on electrode, ground and insulator is white, not thick but evenly coated. V-notch is still about half there, and the metal rim has a thin black coat that's got thick raised spots of grey ash around it.

Any ideas as to what's makin each plug burn differently? Thanks