Two hours... whoa. I salute your iron-butt-itude.
I have about an hour's drive to school/work every day, less if traffic is good: I've started taking Special K breakfast bars with me - one is 90 cal, and the strawberry-flavoured are actually pretty good. And smoothies *are* great: soy milk + any fruit in a blender = awesome. I like plain soy milk with a banana - if you want it to last longer freezing the banana makes the drink harder to get through a straw.

Added bonus being those bananas that are too spotted to eat will freeze happily. A spoon of lowfat peanut butter goes well with the banana-milk, depending on how many calories you want for breakfast.
I like apple chips also - don't add any suger, but dust cinammon and a tiny bit of ground cloves on them before drying/baking. For that matter, I suppose that same brown, derelict banana can be used for chips also!