This is probably the best news I've heard so far all year: Blizzard has won an injunction against Peons4Hire (we'll say their name now), which means that the one-time constant chat spammer is now legally banned from interfering with the game. It sounds like Blizzard sued on nearly all the causes that were speculated on a while ago, and as a result, have outright won their case: according to the injunction, In Game Dollar (the company that advertised Peons4Hire) is "permanently enjoined" from "making any use of the World of Warcraft in-game communication or chat system to advertise any website, business, or commercial endeavor."
Which means, in no uncertain terms, that we'll never see those ingame tells again. The only drawback is that, as Virtually Blind says, this is an injunction, not a decision, and so it doesn't have the "precedential weight" that a decision might-- Blizzard can't really legally use this to walk away with an easy win in the next case that comes along. But over the course of a few different settlements, including stuff happening in other virtual worlds, there is a legal precedent being established against using one company's service without permission to advertise another.
I'm just happy that, after being driven nuts by all that chat spam for so long, Blizzard was able to walk away with a solid victory.