Thanks for your help! I was trying to look at the drives under "my computer"--while I could see the Nook and the card, the card would only show 118mb (when it should have been showing at least 28gb). And the options that would pop up on autoplay would only import photos from my Nook to my computer.
I was able to do move some photos over with your instructions about working on the CM7 side. I am still learning about Android (this has been my first introduction to Android), so I had no idea about this until you said this. Thanks again!