Apple completely revamped its iTunes U app last year to include full course materials, and it looks like that work is paying dividends as the site just trumpeted its billionth content download. Over 250,000 students are now enrolled in the service, which now boasts "thousands" of iTunes U learning materials, according to Cupertino. The company added that 60 percent of those downloads came from outside the US, with educators in 30 different countries -- like recent additions Brazil and Tur
