The idea of plyo's is to relax and contract your muscles as fast as possible. Yes it is primarily for explosive strength but IMO it's something that should be added to any athlete's routine because it will make you so much more dynamic in your abilities.
A few good plyo drills are to take a small barrier, 1.5 ft high, and jump over it, back and forth, sideways, as fast as possible. Also frontwards and backwards.
Set up a few of those barriers/pylons (5-7 is a good number) and you can jump over them all front ways, sideways, backwards, and doing 180s or 90 degree turns as you jump them.
Then to add intensity, you should add some sort of drop beforehand. For example, dropping from a 1-2 foot bench and then jumping up on a 4 foot bench as fast as possible. This is a really good one but it's easy to injure yourself if you're not already physically strong.
Drills on a speed ladder are good to add to plyo routines.
Any kind of sprints are also plyometric by definition. The best sprinting drill I ever did was on a 100m track. Spring 100m, whatever it takes less than 1 min is your rest period. Then you do it again. In other words you sprint 100m every minute.
You need to be careful when doing plyometrics. Unlike most exercises, you don't just "push through" fatigue. Fatigue slows you down, if you're fatigued you're not being explosive and you're actually being counterproductive to your goals. You'll make yourself LESS explosive because you'll be training your slow-twitch muscle fibres to do the work, not your fast-twitch fibers.
:-*
