Via Outside magazine, I learned of this study:
Summary: You can absorb up to 55% more carbohydrates per hour if you use fructose and glucose. The study looked at carbohydrate oxidation during exercise. But it would seem to me that the same principles would apply post-workout.
Anecdotally, I have always recovered better when using fruit juice in addition to other carbs post workout. I guess the study might help explain why.