DC's reaction to Palmer
Alan Gura's blog post links to a pdf of a DC Police memo giving its reaction. Essentially:
1. DC residents who carry an unregistered gun can be charged with failure to register it, but not for carrying it. (By implication, those with registered guns can carry them).
2. Nonresidents who carry should not be arrested (but take note of their ID in case that changes).
3. Registrations cannot be denied because the owner is a nonresident.