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SQL injection
Try reading some more :). For the site, if you decide you want to try out your skills and their security (as I guess you do ;)) you try out different injections and see if you can get what you want.
If you don't know what you're doing I think you should learn at least the basics before even attemting to use these injections on other sites. If you do bad stuff you might get logged…
Pm me… ill answer any questions. i remember not being able to find a good article on SQL injection… [edit] add me on msn at shabouwcaw@hotmail.com and fixed spelling mistakes [/edit]