Google start to respond to query like canada prime minister (probably not for long) directly at top of the results.
It's not working on all queries like vicente fox age, but George Bush age work fine. Try it, sometime it's useful like to remember who directed the movie shining shining director or what's the moon size! Thoses last two exemple come from Jean Veronis
He really have a lot of good answer!
But others time, really, really bad one even if you take the French version of it.