Looking at the title I was hoping the post would say what it did and wasn't a guide to negative seo. Glad to see there are still decent people out there. Props to you Mike
edit: Should have mentioned; I assume negative seo isn't that hard to figure out even for total newbies (like myself). Just analyze how badly you can do with blackhat for yourself and ...
I can't see it being used by anyone who has half a brain though, as mentioned above a lot of people may consider it for revenge and before you know it everyone is having a go at it. And you're all back to square one. What's the point of that...