The Honeynet Project goal is to improve the security of the Internet by sharing lessons learned about the most common online threats. This includes a excellent "Know Your Enemy" series of whitepapers covering Web Application Threats, Fast-Flux Service Networks, Malicious Web Servers, Phishing and more. Also available on the site are a number of honeypot tools available for free download.
browse: honeynet, hacking, tools, web security, whitepapers