Post-Heller Federal Appellate Decision on the Second Amendment:

U.S. v. Fincher (8th Cir.) (thanks to How Appealing for the pointer):

[U]nder Heller, Fincher’s possession of the guns is not protected by the Second Amendment. Machine guns are not in common use by law-abiding citizens for lawful purposes and therefore fall within the category of dangerous and unusual weapons that the government can prohibit for individual use. [The court apparently took the same view as to Fincher's sawed-off shotgun. -EV] Furthermore, Fincher has not directly attacked the federal registration requirements on firearms, and we doubt that any such attack would succeed in light of Heller.

There's more, dealing with Fincher's pre-Heller arguments that his membership in a non-state-run militia group gave his actions constitutional protection.