In case you've never made them, here's my recipe:
1 cup softened butter (room temp)
1/2 cup powdered sugar
1 tsp. vanilla
2 1/4 cup flour
1/4 tsp salt
3/4 chopped nuts if desired
extra powdered sugar
Mix all ingredients with mixer, roll into little balls. Bake at 400' for 10-13 minutes. Roll in powdered sugar while hot, and again when cool.
*sigh* baking is one of my most favorite parts of the holiday season.