Six Apart Guide to Comment Spam

This document describes how malicious or unwanted comments ('comment spam') affect weblogs, the techniques spammers use to abuse weblogs, and the tactics that can be used to prevent and defend against these attacks. Also included is a review of the strengths and weaknesses of each tactic, instructions for implementing them on your weblog and ones which we recommend for the best protection...

source: http://www.sixapart.com/pronet/comment_spam
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web designer's checklist

A list comparing the status of the most common browsers: http://www.findmebyip.com/litmus/

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