Cool tracker thingy
I really like the online version of Fitday, primarily because it lets me enter stuff throughout the day, regardless of where I am, as long as I have internet access.
If not for that, I'd be switching over to this:
A tiny bit less user-friendly than FitDay, because it defaults to measuring everything in grams. It doesn't track exercise. But - it has a function allowing you to set up a recipe, and it does all the calculations. And it tracks a zillion other things, like potassium and Omega-3s.
Free and open source!