This 15th an 16th March was help the fifth editon oh PHP Quebec. And we were lucky enought to have Rasmus Ledorf as a speaker (hey! think I've heard this name somewhere). Well, he's actually the guy who created and made PHP (if you ever have a chance to go to one of his talk I would recommand it!). In his speach, he add a little security topic : SQL injection, cross-side scripting and more. Nothing you guys shouldn't know but I'm letting the link to his slides just in case or if you're interested or whatever...
http://talks.php.net/show/yulUn-accessible for IE usagers...:-?
-!-WARNING-!- Stop reading the following. You may actualy learn something.