Oh, I never answered the question:
On my iPod Touch I have:
Glucose Buddy (FREE) which is an electronic log book for diabetes management. Track, BG, insulin and carbs. Data can be synced to an online account: http://beta.glucosebuddy.com/
Diabetes Log (FREE) is similar to Glucose Buddy but has no online component. Data can be exported to CSV and used in other apps.
WaveSense Diabetes Manager (FREE) does the same job as the other two above but has excellent graphing and charting.
GoMeals (FREE) is a combination restaurant finder, nutrition database and meal planner. It does not track BG or produce any graphs. Data is not exportable.
Combine all four of these apps, add a desktop component for syncing data, and I think we would have one compelling application.