whistleblower newsgroup?

The moderator to alt.whistleblower, instead of a person's mail address, could be a mail alias which invokes a header field stripper. That way it would be impossible to post to the group with your identity in the header. Every posting anonymous! Sort of like a mathematical dual of alt.forgery. I would also suggest a periodic posting explaining exactly how secure that is. (Proof against casual attack, but not against local or global network monitoring.) It seems easy enough. I'd do it myself if I had root anywhere. The perl scripts for remailing would be easily hacked. You could even retain the automatic PGP decryption for the more informed, the more paranoid. Eric