[Bish0pQ]

Dorks can be quite usefull. I've used many of them when I'm "hunting for vulnerable sites", but also if I needed a specific ebook or program. I'm not really sure there is a big difference between Public and Private dorks.

Depends a lot on various factors. For example, I can search "inurl:page_load.php?id=" and I'd get different results than you, even on the "same" Google. I think if you want to generate private HQ dorks, you just have to think really good about it. Think logically, there aren't a lot of people that are going to have a "kfjejsxz.php" file in their website directory if you know what I mean.