L2 (LT xbox) triggers vision control.
This will make you face the puck (or goal if your behind the net), enabling you to skate bakwards in defensive zone and to take better positions for deflections, passes and shots in the offensive zone.
Hold it to hipcheck on defense. Use it in passing lanes to intercept the opponent's passes.
Holding it down also makes your aim better, for both passes and shots.
Also, you can trigger special moves while using VC. L1 triggers a drop pass. If you hold it down and move the RS in a circular motion from 5 o'clock over to 7 o'clock, or vice versa, you'll make a spin move. Pulling the puck back to 5 or 7 o'clock (depending if your're a lefty or righty) while holding L2 triggers a one handed deke.
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it dosent do anything that i can see...same with l3...hold it down til your blue it wont speed up
Look at the category: It says Controls, NHL 10. With that said, you seem to have Auto Skate Backwards turned on. You get better control of your player if you turn it off and use VC to skate backwards.