I am always hungry, so I have found that small, nutritious meals are better for my metabolism than having 3 large meals during the day.

That being said, I prefer to eat a big breakfast before setting out, but not enough to stuff myself. I have mid-morning and mid-afternoon snacks to keep my insatiable tummy silent between meals. I try to choose my foods based on their nutritional content, not by how much they'll fill me up. ( http://www.health.com/health/pdf/pdf_nutrition.html )

I remember watching the TDF last year, and discovered Mr. Armstrong himself has coffee first thing (I can't live without the stuff) and his breakfast is usually a 3-egg omelette followed by some plain pasta.
Mmmm... spaghetti for breakfast.