I was just trying to search for a thread on this subject, so I am glad you asked..
my favorites are mallards, pins, gadwalls, and teal. There are also lot of spoonbills out here, I have found its best to use different cooking methods with them. They tend to have a powerfull taste. Keep in mind that different ducks taste different depending on what they have been eating. Just have to shoot them and try them i guess...
The few geese I have had tasted great too.
With less desirable ducks, stuff like jalapeno poppers are good, or recipies with lots of bacon and cheese.