In addition to the new gold spam report feature introduced in patch 2.1.0, Blizzard has also decided to file a federal lawsuit against one of the largest gold selling companies, Peons4hire. The lawsuit required them to "immediately cease all in-game spamming efforts by all entities and websites under their control."
It was also said that if they refuse to act accordingly, further legal action will be taken.
With this organization pretty much out of the way, hopefully Blizzard will take similar actions against the other companies that have been recently plaguing WoW.