I want to avoid spambots and crapfloods.
True anonymity has its merits, but will be abused all to hell.
Users will have 'egos' and possibly even an 'incognito' ego which has no username (basically like anonymous coward), but the ability to track it back (admin only) to the user to stop abuse.
Basically it comes down to what do you guys want. I don't want crapflooding and spambotting. If you can figure out a (simple) way to avoid it, plus giving users true anonymity, I'm all for it.
Next JE will be about ranking (moderation).