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http://exploit-exercises.com/ has a good virtual machine that you can exploit in your own time. I enjoyed working through Nebula.

Google also had a good introduction on web exploits: http://google-gruyere.appspot.com/

It reminded me a lot of Hack this site[1], which is a bit older, but can be helpful

Ah, finally. I found that site a while ago, didn't bookmark it and couldn't find it again.

Thanks.

Any others that are similar?