Anders and Greg have hit squarely upon a key challenge. Namely, "What is the most efficient way to spread extropian / transhuman memes"? I've often wondered how many people have unsubscribed from the various incarnations of this mailing list when shouting matches erupted. Or how many times people who call themselves extropian have found themselves turning off someone to extropian ideas after a heated, face to face, full blown argument, not because their arguments were unsound, but because they attempted to "convert an umbeliever" by drowning them under a tidal wave of every extropian / transhuman meme all at once.
Far better to win mindspace one rationally argued idea at a time.