I had trouble restoring apps from my SD when I took it from my Dinc to the X. But if you use app brain, just email yourself the HTML text of your app list and you can click on each one to easily re-add each app (sure beats trying to remember what all you had!). But just make a backup of your pictures, music, ringtones, etc, that you want to keep and then reformat in the DX, and copy the backed up stuff back to it and you should be fine.