Thanks so much for taking a look at my setup. Guess I was missing more than I thought.
I see just about every tutorial suggesting a resistor for any LED I put on the board, but I've put a half dozen or more in during the basic blink and fade sketches and had no problems. The very first thing I did was put a 220 Ohm resistor between the 5v and an LED for the blink (choosing to use the breadboard, not pin 13) and the LED wouldn't light until I removed the resistor. Does that make any sense?
Anyway, thanks again and thanks for the links too. I'll be futzing this weekend, hopefully with better results.