I love that website! I agree, it is pretty cool!
That is where I go when I look up foods that are not listed in the food block guide. There is an estimated GL rating, so that kind of gives me an idea of whether or not the food could be considered favorable or not. Or, even for "favorable carbs", some carbs are just better than others, and this tool can help with that. Other neat tools and reports, too. "the Fullness Factor" is neat, and seems fairly accurate, IMO.