Ski with people who are better than you.... if you really want to get good, ski with people who are WAAAAYYYY better than you.
Yes you can practice all you want, but if your practicing the wrong way, then it doesn't mean shit. If you ski with people who are better than you, chances are your gonna see something sweet, or something you've wanted to do and they can help you out.
Seriously though... seeing the trick both in your mind, and actually seeing it are half the battle. The other half is thinking and beileving you can do it.... oh yeah i forgot...then theres that whole part about actually doing it :o)
Racers - You don't own the mountain
Big Mountain skiiers - don't knock it if you havn't tried it
Park Rats - Its not about attitude
Mogul Skiiers - You don't know everything about skiing
Its about having a good time, don't be a generic robot!