Well, I've been using down my freezer stash for some time now, and today it finally got to *that* point... the point where there's enough stuff in it to be pretty full, but not quite enough stuff to keep it all wedged in there tightly when you open the door. At that point, there's nothing to do but empty it out, clean, and reorganize.
Get a cooler, and turn off the freezer. And wear shoes with sensible toes, because it WILL hit you in the feet and shins if it starts sliding.
Check the dates on everything. If you still have ham from last Christmas, consider tossing it. It probably won't kill you, but it's possibly going to be like jerky at this point, depending on how well you packaged it.
This is definitely the time to thaw/defrost and get those little green broccoli flecks off of everything. Then all you need to do is play a little freezer Tetris and you should be good to go... all set for the food madness coming up in a few short weeks.