How to protect your site?
I am not giving you an answer but looking more for informations on preparing oneself for disaster as the one that happen sometime ago with a site that I was running; India's Macromedia User Group. The site was attacked and defaced by F3PN, more details.
[Sorry to those who were trying to access a tutorial and saw a black screen instead, everything is resolved now. And thanks for mailing me about the same.]