When Should You Use Continuous Shooting?
Continuous shooting is useful for a number of situations, particularly those where timing is difficult and the best strategy to getting that perfect shot is really just to take as many as possible—one of the best things about digital cameras.
Sports photography is a good example of this: fast moving, unpredictable objects, where timing your shots is rendered nearly impossible, and you never know what's going to happen next: getting that perfect shot is largely a matter of luck, helped along with a healthy dose of continuous shooting.
Wildlife photography, if anything even more unpredictable than sports photography, is another place where you can benefit from burst mode. A sudden rush of wings from a meadow, a deer bursting from the brush - your best strategy here is to shoot, shoot, shoot and see if you get something good.
Portrait photography, where that perfect, unconscious smile may be too fleeting for you to intentionally capture, is another great place to try burst mode, as you're more likely to catch those perfect expressions by sheer quantity of photos.
Also, if you want to create a montage of photos demonstrating some movement—a soccer player running across the field, a dancer across the stage—continuous shooting is the way to do it. There are many interesting compositions possible with multiple photos of the same subject represented in slightly different ways.