"Die Zeit", Germany's biggest weekly newspaper, introduced a "digital postbox" [1], which enables people to leak documents to the newspaper. They published this as Free Software [2].
First the software makes the data anonymous, by removing metadata and other information from the files. Then the GnuPG encrypted data will be sent to the journalists, who will check the information, and see if they make a story out of it. The software also provides a kind of anonymous postbox, to interact with the the wistleblower.
Regards, Matthias
1. http://blog.zeit.de/zeitansage/2012/07/30/zeit-online-startet-digitalen-brie... 2. https://github.com/zeitonline