I love the iphone app for SP and would love it even more if I could do the following things:
Spin the wheel! I know there's a mobile site but it would be great if I could just do everything in the app.
Track my mileage. When I track miles on the app, it doesn't go to my mileage total.
Copy and paste foods from one day to the next no matter what meal it is. Currently, you can't select what meal to copy to (can't copy your dinner to lunch for the next day which would make copying leftovers so much easier!)