Professor Dennis Galletta has been teaching a summer course at Harvard on Human Factors in Information Systems Design. As part of it, his students conducted some usability testing of the iPhone 4, Samsung’s Windows Phone 7-based Focus, HTC’s Android-based Thunderbolt, and RIM’s BlackBerry Storm. See the results below.
http://techland.time.com/2011/08/10/harvard-student-put-smartphone-usability-to-the-test/