New briefs in Parker case (challenge to DC law)
Here's a webpage with almost all of the briefs filed in the Parker appeal, including the recently-filed reply brief. There are a few amici briefs still being added.
The States' amicus included Idaho, and is antigun. Idaho has since withdrawn itself from participation in the brief.
[Update: in light of comments, the last may be an error. I'd received the page from a pro-gun attorney, who noted something to the effect that Idaho had seen the error of its ways and withdrew. There may have been a mistake as to what brief was being referred to -- I assumed Idaho was on the State's brief]