Rhododendron propagation and pruning are both covered on my website:

Here is a link that might be useful: How to grow rhododendrons and azaleas.

WOW

thanks a bunch.

I would like to prune my Azaleas down about 12-15 inches. I live in the Washington DC area and my plants have just started flowering. What is the best time to prune them down so they will shoot and flower come spring 2009? Should I prune them down immediately after this current round of flowering or wait till late spring or early summer?

Prune soon after they finish blooming. They form next years flower buds during the summer, so pruning later will remove next years bloom.

A side effect is that pruning after they bloom removes the dead flower material. That can help prevent petal blight.