Although it has been mentioned sometimes in loose posts on the forums, I thought I should made a post about it as lately people around here seems to be on a stir about security software for various reasons. The CastleCops wiki
, which is the companion to the main CastleCops site, well known through the Internet, houses some amazing knowledge about malware, how it works and (more important) how to clean it. Not only that, but also information on other matters related to security and privacy on the Internet, as well as insight over quite some security software, including comparisons between the most popular tools around. I hope it will clear most of the questions about this tricky part of computing.
CastleCops Wiki - A complete malware resource
Last minute edit: Most of the content is still flagged as 'beta', and some pages need updating.
via avast! Support Forum