Bangkok Cooking Schools--Not Blue Elephant
my little sister and i did a thai cooking class at someone's home in Bangkok recently. i blogged about it here: http://suzynam.com/blogthai/?p=176
if you know how to cook and want to learn specific things, i'd definitely recommend doing this instead of going to a school. downside is that it's a little more expensive (2,000B per person, tho that's about the same as Blue Elephant and other high end ones) and less fancy.