For those survivalists / preppers out there: Emergency Essentials has a food storage analyzer. Basically calculates all the statistics about your food (nutritional value, etc) and tells you, based on your gender and age, how long you can live off of it.

You can put basically any product they have on their site in it as well as common grocery store items like canned goods. MREs are in it too.

It’s a clever little app. Only complaints is that the interface is a little clunky.. takes awhile to find which buttons do what and it’s not particularly intuitive. I was hoping for something that utilizes web 2.0-ish technologies to make the interface flow better and require me to work less to find the info I want.. Like, maybe the nutritional info could just be an on-hover thing or modal or something.
One big (and quite odd) thing that bothers me is that you can’t add the year supply units they sell as one big unit. From what I can tell, you have to add in each item you plan to buy or currently have, one at a time.

Also, try it out, review it (like I just did) and get $10 credit to beprepared.com. Hooray for free stuff!