| It is not that you want to lean forward so much as you want to stay centered on your equipment. When you tell people to get forward, you only really get them centered.
On skis, I tell athletes to focus on getting their weight over a flat downhill ski. If they can get their downhill ski flat with their weight over it, they will generally get centered.
You should always try to press the flat ski against the surface you are sliding. Therefore, on a c-box or rail, you should come in at a trajectory that allows you to press against the curve of the "c". When you continue on to an "s" box or rail, the same thing should happen - when you get to the middle or the flat, you should be pressing down and continue to press into the last curve as you get there. (did that make sense?)
"Graduating" to rails is not necessary. They are really not that much harder than boxes. I actually prefer rails. Boxes tend to give you a false sense of security.
amydalayna: Think about pressing your shins gently against the tongues of your boots as you go onto a rail. If you do that evenly with both legs, you should be getting centered over your board. This works with 50/50 and with boardslides alike. | 
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