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I don't necessarily trust all OpenID providers to stop bots. I note that ikiwiki allows [[banned_users]], and that there are other todos such as [[todo/openid_user_filtering]] that would extend this. However, it might be nice to have a CAPTCHA system.

I imagine a plugin that modifies the login screen to use http://recaptcha.net/. You would then be required to fill in the captcha as well as log in in the normal way.