Do you use your rear brake?

when riding geared i use the rear brake and often both front and rear, pretty much every single time i wanted to slow down or stop. i don't know why you wouldn't really? unless you're training yourself to not use it. but why would you want to do that? seems a bit daft to me.

From the man himself:

The fastest that you can stop any bike of normal wheelbase is to apply the front brake so hard that the rear wheel is just about to lift off the ground. In this situation, the rear brake cannot contribute to stopping power, since it has no traction.

http://www.sheldonbrown.com/brakturn.html