There are two things you have to remember, and if you do those, you can get away with almost anything else. (These same things apply for painting anything else too.)
Wash the surface thoroughly with a detergent to remove any dirt and oils that might be there (even a new console fresh from the factory would have oils on the surface), then let it dry thoroughly.
Once dry, I definitely recommend using a primer on it, unless you're using a paint like Krylon Fusion that bonds to the plastic. Spray a light coat of primer (so light it doesn't cover completely), then about five minutes later, spray on another light coat. If even the second coat doesn't cover completely it's not a big deal. Let that dry, then apply another coat. Remember that two or three thin coats will look a lot better than a thick coat, and hold the can a good distance away from the console. Doing these two things will help prevent runs and drips.
Use good quality paints, and read the instructions on the can. Different paints behave a little bit differently, so the tips on the side of the can will help you. I like Krylon paints, and I like Rustoleum's Painter's Touch paints a lot more than the regular Rustoleum paints.
Proud replier of post #1000 in the infamous Joel thread 
