I’ve been playing a bit with the website, TwoFoods, which allows side-by-side comparisons of nutritional aspects of two different foods (try Big Mac and Whopper, for example).

It’s a great idea, but it has a long way to go.  For example, comparing french fries at different fast food places did not really bring up useful information.  Also, important aspects such as trans fat content and the like does not come up, either.