I wouldn't expect too much of a boost from an electrolyte drink, but a mild sports drink (Hammer Heed, mentioned earlier, is wonderful) is worth trying to see how it works for you. I like them!
If it's super hot, or you start riding longer distances, then don't skimp on
electrolytes.
Post-ride protein shakes can be great, especially if you 1) want to build muscle or 2) don't get enough protein in your diet already. You can find just about any type of protein powder at
True Nutrition.