As newspapers have laid off thousands of reporters and shuttered their doors, concerns have risen about how investigative reporting that exposes wrong-doing by government and corporations will survive?

ProPublica, a two-year old investigative news reporting nonprofit, is starting to fill the gap. We speak with managing editor Steven Engelberg.

In our interview, Steve recommends several sites that he says are producing great online journalism. Here's the list:

California Watch
MinnPost
Voice of San Diego
Global Post