If you're in Maryland, have you considered looking in the Dulles Corridor? There are more than a few places there that need someone who knows what a pointer is. A lot of military contracting stuff with embedded systems and whatnot. I used to work at a company that does military wireless technology that has several job openings for embedded guys (http://www.sharedspectrum.com/careers). I also know Motorola has an office that has a lot of people doing embedded software work. Maybe think along those lines...
I already replied higher up with a suggestion to check in to the sciences. Seeing as you're in Maryland you're pretty much right in America's Biotechnology hotbed.
Maryland: in and around Howard County.
> Are you constrained geographically?
Yes, as my wife and I are quite settled in our home.