Libertarian theorist, scholar, and activist Tom Palmer (one of the original plaintiffs in the Second Amendment-vindicating Heller case) discusses a new lawsuit he's a plaintiff in, challenging D.C.'s continuing ban on public carrying of weapons for the purpose of self-defense.
The full text of the legal complaint. It's a pretty direct Second Amendment argument, including that D.C. should not be allowed to forbid non-D.C. residents from carrying a weapon for self-defense in D.C.
Lawyer in the case is super Second Amendment defender Alan Gura, who won Heller and will this year be arguing McDonald v. Chicago before the Supreme Court. A Reason interview from July 2009 with Gura on his post-Heller Second Amendment cases.