We can argue about the merits and flaws of Chromebooks all day long, but one thing is clear: They've found a strong foothold in the education market. Indeed, today Google is announcing that more than 30 million Chromebooks are in use by students around the world. To help teachers and students get more out of those devices, Google is also announcing that the Chromebook App Hub it announced back in March is live as of today. Given that Chromebooks already have a store for Chrome web apps as well as Android apps, the new App Hub is differentiating itself in several ways. Google said in a press briefing that they've heard feedback from educators that finding useful tools as well as ideas for how to implement them can be challenging. To address that, the App Hub is made up of apps from developers who've agreed to abide by specific transparency and privacy policies so that schools can make sure software abides by their particular requirements.