Just shooting tonights moon with my new D90, 600mm f4 and a 2x teleconverter

Moon shooting tips:
Use tripod/bean bag any rest and your self timer to keep viberations at a minimum.

Use as long of a lens as you can get and size down 10% to get the sharpness up.

Shoot 2 stops under exposed and use increase contrast in editing to bring the moon up and make the background darker.

Shoot at lowest ISO to prevent noise in the background.

Use manual focus and refocus between shots. Shoot a dozen frames, one of them will be better focused than the others.

For the advanced, use a shareware program like combineZM to "focus stack" several images.

For exposure start around F8 and 1/250 sec. That's just a good starting point and adjust from there.

Full moons are the hardest to shoot. I like this phase because the shadows show relief of the craters so much better.
That's a start. I'm sure I'm forgetting something.