[keso]

I don't know if Google Now is that clever.

If you had an event in a calendar which had something in the "Location"-field it took the location you should be at from there.

Still it is a "whoa" moment. :)

[commandar]

I've had it recognize order confirmations for concert tickets to a show a couple of hours away, parse them, and automatically create a notification with navigation at an appropriate time to leave.

[hrayr]

It finds hotel reservations and flight itineraries in your email, and shows cards based off of those as well.