EH-Net

This is a cool bootable CD made by NETCONTINUUM. It's a vulnerable web app for training and testing your security skills.

Their description:
Badstore.net is dedicated to helping you understand how hackers prey on Web application vulnerabilities, and to showing you how to reduce your exposure. Our Badstore demonstration software is designed to show you common hacking techniques.

Check it out:
http://www.badstore.net

Don