Only 2 problems with tabasco, it tastes bad and it's supposed to be a hot sauce but it's not hot. Blair's sauces on the other hand, teh awesome:

http://extremefood.com/product.php?id=5

The after death actually tastes good and it's not crazy hot (provided you're used to spicy food), though they have milder versions too, the original death sauce is quite a bit milder.

As everyone knows, the "hotness" of chilies is produced by capsaicin, and the level of that is measured in scoville units. Here are some measurements for a little comparison:

http://www.chilliworld.com/FactFile/Scoville_Scale.asp