This is a great start, but I hope it goes so much further. I always liked the (now defunct) Ubiquity project. Here's the first video they made, it's so ambitious! http://vimeo.com/1561578 You could bring up a browser command-line and start typing the name of a command, say "map" to look something up on Google Maps. As soon as you type 'm' it would give a list of autocomplete options. The internationalized parser had a concept of subjects, verbs, and objects, and could autocomplete or even guess some of them.

But the coolest part was how you could add functionality. The framework let you write new commands that interacted well with the parser and gave hints to the autocomplete, and even custom UI with HTML & JS. And then users could subscribe to your commands. Ubiquity would cache the code and periodically, seamlessly upgrade your browser with new versions of the commands you subscribed to.

I was very sad when they discontinued development, and Unity looks like an excellent place to put these ideas to work again.