well i have horrible dark circles under my eyes and theyre genetic does anyone know a really good concealer and how to use it so i get the maximum coverge? thanx@ot

There are a couple of answers to this:
*if you are looking for maximum coverage but a clean almost natural look, my favorite is MAC. Its in a tub, not a tube, so you need a make-up sponge to apply. The make-up sponge will soak up the excess color and help you blend.

*if you are looking for maximum coverage and a high glam look, check out Maybelline if you are on a budget, or Lancome if you are not. Estee Lauder is another good option. These brands have a three in one kit, one option is to lighten the area and then apply color, another option is to reduce any redness and the last is just your complexion color.