Won't hurt anything either way. It will still be fine at Christmas one way or the other. Now if you weren't going to drink it until Christmas 2010, you're better off adding the campden.
Fermenting: Blackberry Wine
Aging: Mulberry Wine, Mint Mead, Dandelion Wine, Mesquite Mead
On Hand: Peach Mango Wine, Huck's Cider, Mulberry Mead, Orange Spice Mead, Cyser, Apfelwein, Maple Cinnamon Mead, Hard Cider, Brown Sugar Cider