FTA: "There’s another option I didn’t originally mention here — leaking over mail. Investigative journalist Julia Angwin of the Wall Street Journal points out that physical mail, dropped in a random post-box with a bogus return address, is perhaps the best way for anonymous one-way communication." DO NOT DO THIS! Every printer leaves a microscopic fingerprint on every printout. The printouts can be traced back to you…
Interesting, I didn't know about printer fingerprints. But I think there are still ways to workaround this. You could print the doc in an internet cafe, or buy a cheap printer and then destroy it, or print it and then take a low quality photocopy. You could even write it by hand or on a typewriter.
Your best bet is large flea markets, where you can buy stuff like WiFi dongles, etc. with cash. Then wait a while before you use them.
I can't believe I'm having to write this, either. This is like giving instructions to a Soviet activist in the Cold War days, but ironically it is in my own country. How did we fall so far?