Wolfram Alpha (http://www.wolframalpha.com/) calls itself a ‘computational knowledge engine’. Whereas Google indexes information other people have written, Wolfram Alpha uses artificial intelligence to come up with new answers to your queries.
Why am I posting this on my website? Well, it knows the nutritional values of hundreds of different foods and is able to compute the content of any amount of them. So say you have a meal of 3 oz. of salmon and 1 cup of asparagus, it can tell you the levels of all the macro- and micro-nutrients in that meal. Or you can tell it what you had in a day and see if you’re short on any nutrients.
What a wonderful new system to help you determine exactly what you are eating!