'Designing out' spam
As the old idiom goes, prevention is always better than a cure.
This holds true more than ever with Spam, and more than ever prevention is definitely possible.
Advanced
These articles are written for users who are very computer-savvy.
Regarding 'Inaccessibility of CAPTCHA'
Matt May, whilst at the W3C, wrote an excellent paper on the inaccessability of the most common forms of CAPTCHAs.
However, for many this type of spam-deterrent is the only effective method they can easily implement.
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