[keeperofdakeys]

The examples you give don't feel natural to me, they feel too precalculated. Something like wolframalpha seems really awesome when you ask it the right things, but you have to know what to ask. (In fact, one of the pages from the video looks very familiar http://www.wolframalpha.com/input/?i=moon+distance+from+eart... )

For something like Siri, it would impress me most to do mainly one thing well; to understand my context. This is especially difficult if a sentence draws on distinct subject areas. The video seems to give hope for it to be able to do this though.