Thanks for the good advice, Arlon! I've had semi-decent photos of the full moon, before, but haven't gotten out for anything smaller yet. I will definitely try your technique next time the sky is clear enough. Here's my last full attempt with a 300mm lens, tripod, and remote control:
Bigger
Camera: Olympus E-520
Shutter: 1/640 sec
Aperture: f/5.6
ISO: 100
I went back and re-edited the original with your contrast tips, and it worked really well!