New Mexico State University has named a new chile the worlds hottest.
A couple years ago it was the Bhut Jolokia from India but new tests have shown three even hotter.
Using Scoville Units where the jalapenos are rated at 4000-50000 SHU
the hotter ones are :
Trinidad Scorpion 2 million SHU
Chocolate 7-pot 1.17 million SHU
7-pot 1.06 SHU
Jolokia 1.02 SHU

I can't eat without heat but I'm going to stick with habaneros. These things might kill.