There are two great books on this by Matt Fitzgerald that I love: Racing Weight and The New Rules of Marathon and Half MArathon Nutrition. Both have some great advice on diet and nutrition.

I like that he concentrates on raising the overall level of your diet quality. So, he isn't saying "don't eat white bread"; instead, he has categories of foods you should look to eat more of than other categories. For example, you should eat more whole grains and less refined grains.

After a long run, I eat a meal that has a high carb count and some protein in there as well. Some go-to post long run meals (which are always breakfast for me) are egg and veggie wrap with fruit on the side, whole wheat toast with almond butter and banana with fruit juice, or kashi go lean cereal with nuts, berries and milk.

Ditto what Carrie said! Also, after hard training sessions, I usually try to eat something small right away (i.e., something that can be sitting in the trunk of my car). Often chocolate milk (Tru moo, or something in one of those asceptic containers) and a banana will do in a crunch. Or if the temps aren't too high, fruit and yogurt.

In the avoid column: anything you do not normally eat.