Read the first few links, particularily "what is a scoville unit?" (unless you already know what one is) before looking at the hot sauces:
http://www.chez-williams.com/Hot%20Sauce/hothome.htm
In high school I was dared to eat a tablespoon of Dave's Ultimate Insanity. It was not pretty.
Anyway, what is everyone's favorite sauce? I love Louisiana Habanero... Its about 3-4 times as hot as Tabasco, so probably about 5-8000 scoville units.