The TV show Numb3rs recently featured MMOGs as a major plot device. TV Squad has the review of the episode.
Online games, alliances, spawned alternate realities... and prize money. The more things change, the more they stay the same. If there´s money involved, then greed, deception, and murder usually follow on a crime procedural.
The story itself was very enjoyable as it gave literal meaning to the idea of "catching an online predator." A new MMO (Massively Multi-Player Online game) had started a spawned ARG (Alternate Reality Game), where players had to walk away from their computers and search for clues in the real world. Clues that would lead to a million dollar prize. If that sounds confusing, then stop reading because it isn´t going to get any easier. A better description can be found at our MMO themed sister-site Massively. They talk about the games. I talk about the TV.