WP Hashcash
I delayed as long as possible, but I’ve now been forced to the install WP Hashcash on my Weblog:
WP Hashcash is an antispam plugin that eradicates comment spam on Wordpress blogs. It works because your visitors must use Javascript to submit a proof-of-work that proves they opened your website in a web browser, not a robot.
Unfortunately, Javascript is required in order to submit a comment, so site accessibility has been turned down just a notch.
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Well, on the up shot, with everything being all AJAX-ish these days, most everyone has Javascript, or at least enough to mint stamps (cellphones, etc. seem a little limited yet.)
I guess you can do a hybrid CAPTCHA/HashCash method. That would give an automatic alternative to blind users as well.