You're welcome Tim, and thanks (to you and all) for the nice comments.
My first lunar photos were with the 100-400 as well (with my D30 ages ago). Yes, I agree, not the absolute top quality at the pixel level, but not bad. As a deep sky wide-field "telescope" the 100-400 isn't bad at all, especially if you pull back from 400mm a bit. I did this photo of Comet Holmes with my 40D and 100-400:
By the way, next time you're shooting up into the sky try Live View, Tim. You'll still have to get down and look up but it does help not to have to look through the VF.
-Noel