Sweet indeed. I'm surprised O'Malley hasn't started ending the tax reciprocity agreement with those states. But you have a slight mistake. Delaware is not on the list. Virginia is.
And Delaware is a big exception. If you live in Delaware and work in Maryland, you will have to file a Maryland tax return on that income. And the worst part is, the Maryland income tax rate is actually higher for out-of-state residents than it is for in-state residents. A real scam... but it is Maryland after all.