Dan Kaminsky
Dan Kaminsky is credited with discovering some unspecified vulnerabilities in DNS that allow for cache poisoning on a massive the-intarweb-tubes-will-burst-and-flood-your-basement scale. There has been massive media attention over this vulnerability and a large amount of backlash in the security community over the lack of details. When the full details of the vulnerability are revealed at BlackHat, the masses will decide whether the hype and secrecy were worth it. And, more importantly, the Pwnie Judges will vote on whether Dan gets the Pwnie for Most Overhyped Bug.