Amazing spam filter

These days, any site that has comments or lets users send email, must have some type of anti-spam system. The most common type is a captcha challenge. For me, it usually takes 2 or 3 tries (if not more) for me to get a challenge correct. I stumbled upon a WordPress plugin called WP Hashcash that uses a Javascript "challenge" to fight spam. The really cool part is that people that use standard browsers that have Javascript turned on (if you have Javascript turned off, you pretty much can't see many cool sites), don't see a challenge and can just comment normally. Automated systems haven't been trained to actually run the Javascript on the comment pages therefore the plugin marks the comments as spam. The plugin is catching a ton of spam.

This is just too cool to have a system in place that (for now) combats spam without inconveniencing my readers!