oh god. crunches? squats? I don't even know what half of these things *are*.
anyway, Lost, about that flat stomach;
You can't just tone one area of your body. Even if your happy with your overall weight, your body might simply be the type that likes to store some fat on your tummy; You can work out and build the most spectacular abs, but they wont be visible under that layer, in fact it'll just make your tummy look bigger! Many people fall into this trap, and some are just unlucky to have bodies who think the stomach is a good place to store fat.
Others are like my mom, who are super skinny (i'm talking some online BMI calculators consider her underweight) and work out and do yoga every day (she even works with weights I can't get off the ground), but who are cursed with IBS, bad digestion, etc, which makes their stomach blow up like a balloon.
this website
http://www.flat-stomach-exercises.com/ contains pretty much everything you need to know to acquire a flat stomach. I am on the same quest.
EDIT:
oh btw, this is my weight loss since I started changing my eating habits:

IGNORE the last dot, it is just my goal for the end of august.