Apple's iTunes U has hit the 600 million download mark, according to The Loop.
Offering resources such as lectures, demonstrations and lessons, iTunes U has come a long way in just over four years, with more than 1,000 educational establishments with active accounts.
According to the report, 30 percent of traffic comes from iOS devices and 60 percent from outside the US. iTunes U is available in 123 countries.
In August 2010, Apple celebrated 300 million downloads from iTunes U, meaning that it has doubled that haul in little over a year.