yeah listen to him, I just got a authenicator from blizzard and it makes my account security way higher. Its definetly worth it. I encourage all of you to get one, it keeps you from getting your account hacked. I have myself an iPhone so I just download the blizzard authenicator from the Itunes app store for free, and then i set it up with my battle.net account. Then whenever i go to log in, the authenicator on my phone randomly makes me a code to type in everytime i log into WoW.
Please get it, I would hate to see one of my guildies get hacked.