What I think has always bothered me about this (apparently I've come back to throw myself over the coals at last) is just that somewhere along the line the crusade for more Big O metamorphosed from the hope and enthusiasm of its fanbase to a full-blown sense of entitlement.
I disagree. The thing is that I've ne'er gotten the impression of entitlement from any 'crusaders.' At least from the most of them. There are always a few crazies. Most of the time however, you've just got fans who want to give the show a uh, third chance. Yeah, it's a little unreasonable, but the show didn't do bad at all here in the US. Just comedies where cheaper.
So, uh.. if you send a truckload of tomatoes, basically what you're doing is pissing off the messenger and ensuring that what you want to say will never be heard/read by anyone important ever.
I got the impression that was more of a publicity stunt thing, more intended to catch the eye of the general anime community than anything else. Then again, if advertising SaveBigO on Megatokyo didn't succeed at that, it's probably a crapshoot.
I always figured that the only chance a petition had is if it created a Dilbert Principle scenario and one letter ended up on some incompetent executives desk and viola suddenly it is a HUGE IMPORTANT THING! That or somebody who is rich becomes a fan, or conversely, a fan becomes rich. The former is the more probable I think.
Really, if anythings going to change the mind of anyone it's going to be the sales of the recent DVD re-releases. (If anyone actually thinks the family guy and futurama fan petitions actually made a difference in the long run, please smack yourself in the face until you gain some sense). So if your not broke like me, and
reeeaaaaally want a third season, buy out all your copies at a local store and then sell them on Ebay or something.