Best recommendations for posting anonymously?? Looking for pointers

[Engineering Safety Organization <engsafety@engsafety.org>]

Hi,

Does  anyone  have  any  great   suggestions  for  how  to  best  post
anonymously to web  sites and how to create web  sites and web servers
to allow  participants a reasonable  expectation of anonymity  so that
they can freely post their concerns?

There is a  pro-regulation website, http://www.engsafety.org, on which
I would like to add directions describing how best to post anonymously
for end users.  I would like  US govt regulators to be able to comment
about the problems and corruption they encounter at their jobs without
fear of retaliation, but I am not sure how best to set-up a site which
could provide this service.  The  hope would be to coordinate a bright
light on the current regulatory  problems to help speed up the process
of regulatory reform through safe public discourse.

Have any other site already successfully achieved this result?

Help and feedback are appreciated.

Thanks,

Engsafety