Hey Jim, I'm way ahead of you. I washed the area with engine shampoo this afternoon, took it on a road test, and rechecked it after. Not a drop showing.
It was getting home tonight I took a peek with the flashlight, and noticed it was soaked again. Definitely NOT the oil filter. I suspect the oil pan as well, but find it weird how the splash "creeps" up towards the crank.
I always run synthetic oil, but my last oil change last month was with Mobil 1 for the first time in awhile. Coincidence? Hmm..?