What steps should I take BEFORE I factory reset my Android phone?

Hi! I have a Droid 2 that is starting to act “odd.” I am thinking it might be time for a factory reset. I keep all of my apps on the internal memory due to a problem I found with “App2SD.” The memory is not full and the SD card has around 7 GB of space. I have an AppBrain account and (of course) a Market account.

What should I do before the reset? Should I back anything up? I would hate to loose my progress in Angry Birds.

Thanks!