Hatching brine shrimp is easy, raising them is not if you are doing it in any appreciable stocking densities.
They should be rinsed in fresh water before placing them in the tank as the cysts can harbor nasty bacteria that sometimes can wipe out a tank.
(Brine Shrimp Direct warns of rinsing them - see their site)
I would never let hatching water come in contact with my tanks because of this.
Depending on what you are feeding, decapping the cysts and putting them in the tank without hatching can be the most nutritious way to feed the tank.
If you are hatching them out, they should be used immediately upon hatchout as the nauplii then start consuming the egg sack thereby decreasing the nutrient value.
For the most complete information available on brine shrimp (artemia) see the United Nations site on Live Foods for Aquaculure where there is an Artemia section prepared by the Artemia Reference Centre at the University of Ghent.
CLICK HERE AND SCROLL DOWN TO SECTION 4.0
There is also an excellent section on brine shrimp nutrition.
For those willing to do the work to raise brine shrimp to adult in meaningful numbers go to my brine page.
RASING BRINE SHRIMP TO ADULT
For those wishing to buy live adult brine shrimp but find they aren't available in their area:
LIVE BRINE SHRIMP