I use an iPhone 1.0, but I have the new 2.0 firmware. There is a new app for sale in the App Store for called Glucose-Charter. Here’s the info:

Glucose-Charter
Category: Healthcare & Fitness
Released: Jul 17, 2008
Price: $4.99

Description:
Glucose-Charter(tm) is a blood glucose recording tool installed on your iPhone. But more than that, with its unique food database it will assist you to make informed dietary choices. Glucose-Charter(tm) was developed to provide you with self-monitoring & logging your blood glucose, food guidance and to reinforce the positive benefits of frequent exercise. In using the Glucose-Charter(tm) program you will find an extensive food database that presents several different means for evaluating the foods you choose to eat. The program will log all the foods eaten and is designed to remember your favorite foods. The unique Glucose-Charter(tm) food information display will make eating decisions much easier and provide you and your doctor with the needed record keeping maximizing the benefits of your ongoing treatment.

I’ve just got it and I haven’t had much time to play around on it, but one thing it doesn’t seem to do which would be nice is to let you enter your previous blood sugar readings. The food information database is interesting, it tells you the GI (glycemic index) and GL (glycemic load) of food and it is searchable. I’ll evaluate it further and post what I find.