Comment Stop Comment Spam By Analysing the Actual Content (Score 2, Insightful) 197
Enough with the annoying captcha's stop comment spam by just analyzing the content.
Free and works well:
http://defensio.com/
PL/I -- "the fatal disease" -- belongs more to the problem set than to the solution set. -- Edsger W. Dijkstra, SIGPLAN Notices, Volume 17, Number 5
