One of the most popular blogging networks in Blogger.com has been overrun of late with Blog Spam or Splogs. Apparently, automated programs are being utilized to artificially seed blogger.com weblogs with the sole intent of promoting affiliated websites, increasing the number of links as well as ad impressions. It's become a major problem namely because it's forcing poor search results and wasting disk space and bandwidth of blogger. So what is the owner of Blogger (Google) doing about it? Most recently, they have implemented Captcha, a type of challenge-response test used in computing in order to determine whether or not the user is human. You may have seen Captcha at work when trying to log in to secure websites. The most common type include the distortion of letters or a sequence of letters. Sometimes referred to as a reverse turing test, Captchas are used to prevent bots from using various types of services such as free email accounts. If your website has been the victim of automated scripts wreaking havoc visit one of the following sites to learn more about Captchas:

The Captcha Project
The JCaptcha Project - open-source Java framework for Captcha integration
VeriWord - a PHP implementation
Captchas.net - free Captcha Service (image and audio)