The Open University is making course material available on Apple’s download site. Apple’s iTunes Store has built its reputation on music downloads, but it could be about to usher in a new era of learning on the move. In the not-too-distant future, when you see someone transfixed to their iPod, they may be enjoying a quick burst of environmental studies or English literature. It’s all thanks to an educational download service called “iTunes U.” Launched by Apple in May 2007, it was originally restricted to American universities.