Hate the captcha that Science 2.0 uses when you want to leave a comment? So do we.
But spammers make money spamming and there is no money at all in preventing it, so many media companies are a lot more annoying than us. They make you create a proprietary account just to leave a comment, some allow third party general tools, like Disqus or Facebook. We don't want anonymous people here so we are stuck with captcha.
Maybe not for long. The minteye startup has created a “no-type solution” which utilizes a slider that tasks users to straighten out a contorted image.