Greenwald is liberal, but I've never seen anything to suggest he's anything other than an honest man. It's also in his own interests to expose the way corporate interests manipulate elections through the media. Why wouldn't he be on board, assuming we got him the evidence to work with?
Anyway, I think this is a good idea in theory, but I'm not sure how effective it will be in practice. For starters, developing a site like Wikileaks requires some resources and technical knowledge. For instance, the site has to carefully scrub any trace of the document's origins from its logs, etc. to protect whistleblowers. I'm sure someone has the skills and confidence, and someone has a suitable location, but there are larger hurdles: Actually broadcasting the existence of such a website to media employees could be difficult, and it would be even more difficult to convince them it's not a trap. What really bothers me though is that Wikileaks and Openleaks already exist! They could easily serve this purpose, but no leaks have been reported. Assuming they're not traps themselves, that leads me to believe that nobody in the media is likely to post proof...and they might not even have it. The blackout orders could be verbal or even mostly implied.
