HD Moore and "spoonm" (must be some cool hacker name) this week released the latest version of Metasploit Framework, an "advanced open-source platform for developing, testing, and using exploit code."
"Both researchers demonstrated the tool "owning," or taking over, Mac OS X, Windows 2000 Server and Windows XP systems, although the duo used a VMWare virtual machine to speed the process. Metasploit even runs on a Sharp Zaurus PDA, which when equipped with a Wi-Fi card can be used to attack while mobile." - Eweek.
Needless to say, I am downloading the source code as we speak. I just fear what might happen to this in the wrong hands....