In addition, after setting Language to U.S. English, you'll get lots more information than if you type in commands via it's region specific settings.
I used to despise Siri, conversely I love and use Google Now daily.
It rapidly continues to become more useful the more you use it. After just one week it's a very impressive tool for more uses than I would have imagined. I can only imagine how great it will be in another month.