You're only safe as long as nobody reads what you've written, thinks it's good, and submits it to somewhere. I'm told that earlier today I was on the digg front page, and I DIDN'T submit there. Fortunately the server can now easily handle anything digg can throw at me.

The lesson here for those of you on shared hosting is this: Your host has likely not made any of these performance tweaks and will be unable to stand up to a large crowd of users coming in all at once. The usual shared-host response to getting /.ed is to suspend your account.