Research has show chocolate milk to be a good recovery drink. It has the correct blend of carbs to replenish energy stores and protein to repair muscle. This SP article gives more info on what your post workout meal/snack should contain: www.sparkpeople.com/resource/nutrition_art
If you are concerned about the sugar in chocolate milk (about 4 teaspoons/cup), then mix your own or go 1/2 chocolate 1/2 white.
Hope this helps