is there anywhere i can find a list of stations that broadcast in DD on DirecTV??

Just the hd channels, and a few of the premium channels and those only on premier movies usually. Most ppv movies.

I think HBO does when available (e.g. The Sopranos, Six Feet Under and Carvinale). Usually they will have a screen come up prior to the show that says Broadcast in Dolby Digital 5.1.