iPods in the Classroom

I found an interesting article iLearning: Elementary, high school students use Apple devices in IDEA pilot program where one school system is piloting the use of iPods in elementary and high school classes. The program began in February. Students in the pilot program have shown a slight increase in test scores since the iPod was introduced. Unfortunately, the program is not a scientific study. It would be nice if someone conducts a program like this in a more scientific way. By conducting a scientific study, hardcore evidence could be obtained to justify the purchase and use of handheld computers in the classroom. Has anyone come across a U.S. scientific study similar to this while on the web?