Good point, Ingvar, but I think I'm finally in good shape.

Unfortunately, I believe many of my "mystery" problems were due to faulty connections on my breadboard. Once I re-seated all my components things started working more reliably.

At any rate I'm now reading both channels successfully, and I only have to work out some math issues to maximize the resolution of the current sensor.

Next step is to etch a board, put one together, and send it up with my R/C plane!

Thanks to all for your help. This is a very responsive community, and I hope I can add value to it as my skills improve.

-Jeff