I just posted this but anyway: can you tell me an example of someone that got compromised using tor + javascript off/flash off/stupid shit off and didn't do stupid mistakes like revealing your real name like the silk road dude? as far as i know it never happened but im not sure.
it is virtually impossible to track somebody with these conditions unless you post your name and where you live
I use tor, and it is quite evident that google have no problems identifying me. I suppose they use browser fingerprinting and of course cookies. And flash has its own cookie system, other extensions too, I suppose. So in addition to using tor, you should turn off lots of stuff in the browser, which is already done in the tor-browser.
If you want more untracability, you could use a separate machine or virtual machine, and make sure you don't ever use your real identity on that machine. Maybe shred everything after use, and start every session on a clean machine.
When you write something on a message board or whatever, it is easy to let slip through information that can reveal your identity.
As you understand, it is quite difficult, in practice, to avoid being tracked.