An MMPORPG (Massive Multiplayer Online Role Playing Game) for eduational use. A role playing game usually consists of doing something (hunting monsters, casting spells, etc...) in order to gain "experience points". With those "experience points", you are able to defeat bigger monsters, travel to distant places, etc... Well, how about the same thing, only, instead of killing monsters, you would have to figure out problems (quest-based). With each problem solved, you could get...

An online recipes website, that allows you to search for recipes based on ingredients. Not main ingredients, like most recipe sites, but ALL ingredients. In other words, I would log onto the site, enter in what I have in the fridge and in the cupboard (store the info in a database so I don't have to add it every time), and then look for what I can cook. I would only see recipes that I would be able to make at that moment with the ingredients I allready have.