This might be helpful - iPhone apps for diabetics

Here’s a list from November 2010 of iPhone apps for diabetics:

I just downloaded on of them to test-drive: Glucose Buddy.

This is a tool that I've developed to help with my own insulin and carbohydrate calculations when I couldn't find one to do it. I created a version that anyone can use because so many people wanted to know where I got it and wanted to know if they could use it too. I designed it to run on my iPhone but it should work on any device with internet access.

Free Insulin & Carbohydrate Calculator

It is hosted on a free web server so there are a couple of adds at the top and bottom of the page and a small popup window that can be a little annoying when the page is loaded for the first time but it is a great little app that I use every day.