From this article at NMSU:
Bhut Jolokia, at 1,001,304 Scoville Heat Units (SHU), is nearly twice as hot as Red Savina, the chile pepper variety it replaces as the world’s hottest. A New Mexico green chile contains about 1,500 SHUs and an average jalapeno measures at about 10,000 SHUs.
In February 2007, Guinness World Records certified the bhut jolokia as the world’s hottest chili pepper.
I know Jalapeños are quite hot, but this contains a hundred times more heat!