NPR announced on their blog last week:
In the spirit of the Android operating system, we’ve decided to make the code for NPR’s app public. We believe this matches perfectly with NPR's public service mission. Public media implies our audiences have a stake in our product, and open source projects are a means to better connect to our stakeholders.
They also reported that they have 100k unique users each month. Incase you're interested, here is the video they made about it (cute):