What are the best places to get 3D printing news?

It seems as though every other day, breaking news on 3D printing pops up in a mainstream article somewhere in the world. So what are the best places to keep track of everything that is happening in the 3D printing space?

This is a companion discussion topic for the original entry at http://reprage.com/post/49504399210/what-are-the-best-places-to-get-3d-printing-news