Thing Number 2 - I think I'm most excited about the ability to add frequently viewed websites to my iphone's homepage (and I'm feeling foolish for not realizing this earlier - it's so simple). This will save much time!
I think I'll need to use Siri more often. I particularly like the ability to add reminders verbally. Similarly, I may try to use the microphone feature in the notes tool more frequently, too.
The level feature is fun - just waiting to use it.