I haven't done this in a while, and I've got a few more states filled in since I did it last. I'm down to 6 that I haven't been to in the continental US. One (South Carolina) might get filled in tonight, depending on how things go at dinner. A couple of the others are within fairly easy reach. OTOH, I doubt I'll get to Idaho or Montana anytime soon.
If you want to do this one yourself, and have a copy of just about any version of Photoshop or The GIMP, check out KT's entry on how to do it.