I used plyometrics prior to the track season my senior year of high school and they helped a ton. I ran 100's and 200's and made it to State Track. I owe a lot of my success to the time I spent in the weightroom lifting (
strength training and
olympic lifting) and doing plyometrics rather than the time I spent out on the track.
A great book to look at would be
Explosive Running: Using the Science of Kinesiology to Improve Your Performance by Dr. Michael Yessis
Some great plyometrics to do (some of which will be redundant to what Most Muscle already said) are:
*Skipping (Although it looked dumb, it was a great way to start out plyometric training)
*Depth Jumps
*Box Jumps (great one)
*Double Jumps/Triple Jumps
*Medicine Ball Throws (Forward)
*Medicine Ball Throws (Backward)
*Trunk Twists w/ Medicine Ball
*Dot Drills (Focus on footwork and speed)
*Speed Ladders
Prior to track season I did the plyometrics involving jumping on Tuesday and the plyometrics involving twists, throws, and footwork on Friday to spread things out a little bit. Basically the only thing I did during track season was dot drills and speed ladders because everything else really made me tired for meets.
By the way, are you going to be sprinting in competition and coming out of starting blocks?