Nmap From an Ethical Hacker's Point of View
ddonzal notes a new tutorial that introduces Nmap from the viewpoint of an ethical hacker. (Part 1 of 2 parts is up now.) The author is Kirby Tucker, who writes: "After completing this 2 Part Series and having practiced the techniques described, one should not only be able to sit at a 'roundtable' with advanced security professionals and 'hold their own' in a discussion concerning Nmap, but also utilize this great tool in protecting their own network."
Fyodor is more of a "cracker", to use the proper term. A few years ago, Fyodor got caught breaking into a Windows PC owned by somebody who had humiliated him online.
Just desserts? Maybe. Ethical? Not a chance. Somebody with that level of skill should be using his abilities for good, not evil.