im curious about this myself, having the droid x and the dock and car dock are basically the same where you have to slide the phone on top of the connector M/F... the car dock for the nexus is a 3 pin contact with no insertion needed. I would imagine a case would cause the phone to sit away from the contact point if that makes any sense.
also for the car dock it looks like it is an exact fit into the dock so just going by the picture i would have to say no.