Saw this one via DC Blogs: Bad Metro Information Design. I guess I don't think about how confusing that map is since I am pretty familiar with metro, including what car to get on on orange/blue to make changing at metro center easiest. I still get absolutely turned around inside the stations, and certainly don't ave anything close to instinct in terms of going in the right direction after the fare gates because IT IS NOT CLEARLY MARKED. Exception - Smithsonian - has signs for VA/MD or something that are easy to see, you don't have to check out the little lists on those silly polls.
I still vote for inbound/outbound but that will never happen.