Here are some examples Siri is capable of:
"Who are you?" Siri says "I am a humble personal assistant."
"How many days are there until Christmas?" Siri says: 82 days. Also, 2 months 21 days, 11 weeks 5 days, 58 weekdays, and .22 years.
"Search Wikipedia for Neil Armstrong." Suddenly, the world's greatest American is up on screen, looking like a man's man in his space suit.
Siri not only remembers, Siri knows.
Scott's creating a reminder "Remind me to call my wife when I leave work." Siri asks to confirm and makes the reminder. Siri already knew who his wife is and set up a geofence around work.
"What time is it in Paris?" Siri responds: "The time in Paris, France is 8:16pm." Siri also brings up a live clock.
"Do I need a raincoat today?" Siri responds "It sure looks like rain today."