An interesting blog post that speculates that the Hotmail and Yahoo CAPTCHA systems have been compromised by spammers.
http://tech.blorge.com/Structure:%20/2007/07/08/spammers-overcome-hotmail-and-yahoo-captcha-systems/
[Editor's Note (Valle): I'm sure the good guys are developing new CAPTCHA systems that can't be easily read by computers. In the meantime, we will all probably see a rise in spam. The IronPort S series appliance with its SenderBase technology would help mitigate this issue.
