I'd also like to add, if there's an area that is too tricky to get to by hand with the traditional sound deadener that comes in sheets and is cut-to-fit, DEI makes a spray on sound deadening product called Boom Mat. In previous installs, I've used the dynomat in the doors and then sprayed a layer of boom mat over it. Very good combination, and other companies offer similar spray on products at the FLAPS.

P.S. this should be a sticky!