Bots. Like it or not, they're part of online games like World of Warcraft. A US court ruled on the legality of one particular popular and profitable bot.
WoW Glider is a program for World of Warcraft that basically turns your character into one of those annoying bots you see running about, getting all the essence of water. In short, it levels up avatars. The company that created the program, MDY Industries, raked in millions off WoW Glider.
A suit was originally filed way back in 2007 with WoW developer Blizzard saying that WoW Glider infringes their IP, allows cheating and circumvents copyright protections.
As website Gamer/Law (via Edge) explains, Blizzard lost the copyright argument, but did win the argument that WoW Glider breaks the game's user agreement. Thus, the sale of WoW Glider is still banned. What's more, since the circuit court's ruling overturned the verdict, this either means a retrial or appeals to the US Supreme Court.
Don't close the book on this case just yet. This is going to be a long hard fight of cataclysmic proportions.