Olympic Final 2012 A few tips to watch for in this video:
* speed is vital- it is a race!
* don't get too close to the hurdle, head down as you jump
* strong arm action opposite side to legs-right arm with left leg and vice versa,
* lead leg action like kicking down a door-don't hang in the air, get your leg down quickly 
* whip trail leg over hurdle quickly and take a long step
* three steps to next hurdle, sprint to finish line from the last hurdle (don't try to fall over the line)

Warmup and training video.  More tips here.