Some little things I do to make things healthier:
-high fiber, whole wheat bread in the stuffing
-turkey sausage in the stuffing instead of pork sausage
-REAL unsalted butter, no trans-fat laden margarine

-sea salt (naturally lower in sodium)
-organic chicken broth for gravy, potatoes and stuffing (lower sodium and fat)
-organic turkey from a local farm-
-instead of candied yams, I roast them plain OR put just a tiny bit of butter and brown sugar
I also make homemade cranberry sauce. It's really easy and it's healthier because it's not processed. You just take 1 cup sugar (I use cane sugar, regular sugar works fine), 1 cup water and 1 bag of fresh cranberries. Boil for 10 minutes, cover and let sit until cooled, then refrigerate.
Last year I made banana cream pie and that was a big hit. It was just a regular pie crust with sliced bananas on the bottom, then a layer of sugarfree vanilla pudding, then a layer of lite cool whip on top. It tasted really light and refreshing compared to all the other heavy foods!