UNITED STATES, July 2011: The url at source (above) is now available on iPhone, iPod touch, and iPad. And it’s free!
You can also search for keywords ‘vegan ingredients’ or ‘vegetarian ingredients’ in the Apple Store.
The Guide lists the uses, sources, and definitions of 200 common food ingredients. It also states whether the commercial source of the ingredient is vegan, typically vegan, vegetarian, typically vegetarian, typically non-vegetarian, or non-vegetarian.