1) A home screen widget that shows the day's net calories (or is configurable to show which ever statistic is most important to the user).
2) Exercise entry by intent so Buddy Runner, Cardio Trainer, WorkItOut, etc, can automatically add to the exercise diary.
3) An overview of daily statistics as the Counter Home screen, with most of the current Counter Home optioins moved to the menu.
What would other people like to see?
PS, if the Calorie Counter App were open sourced I'd be willing to see what I could contribute.
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