No, the death threats against Kathy Sierra are not evidence of a need for a blogging code of conduct. They were death threats, which means that there are already codes -- legal ones -- in place for them. As far as any of the bad behavior leading up to the threats (stuff like meankids.org, etc), there are already accepted social mores and ethical codes of conduct for dealing with people (and deal with people who insist on being assholes). They translate to the blogosphere You can't manually force a new code of conduct without crippling blogs as a whole (and bitchslapping the First Amendment), and anything that's unenforceable would accomplish little.