Innovation. Experimentation. Change.
Excellent use of excel, have you thought about taking your gradebook to the cloud and using Google Docs? This would mean you could enter grades from any device with an internet connection.
That is a great idea, and definitely a good way to use tablet technology such as the iPad. Small but practical enough to bring into the gymnasium with us. I was a student teacher in a school where they gave every PE teacher an iTouch, but they just used it for attendance.