I agree with the frustrating left lane chain due to one asshole going slower or equal to the traffic on the right (usually equal, so that nobody can get by).
Once I can actually get around someone like this, sometimes I will get in front of him and slow down significantly... well below the speed limit for two purposes:
1) It annoys him
2) it creates a gap where people in the chain can pass this asshole on the right.
VA does have a left lane for passing only law, but i've never seen it enforced.
My latest grip about the beltway is the ramp from 66E to get on 495S. It used to be two exit lanes that merge once they reach the beltway. Due to recent construction, the 2nd lane has been closed off and now there's only one exit lane. Since the merge was eliminated, I expected the flow of traffic to speed UP, however now, people tend to slow down or stop as if there was no place to merge at the end of the ramp..... The lane does not, in fact end, so I see no reason to even slow down--> the lane now has no merge and doesnt end. Why do people act as if they're driving off the edge of a cliff? Its gotten so bad in fact, that I now go a few miles further east and backtrack because its faster than sitting in this exit lane.