Some of the most compelling arguments yet for incorporation of the 2nd amendment have been filed. The Constitutional Accountability Center filed an amicus brief arguing the 2nd amendment should be incorporated under the privileges and immunities of the fourteenth. That's a very compelling and interesting argument. There's an amicus from law enforcement with an in depth analysis of crime statistics. There's an amicus from state legislators that makes the strongest argument yet for incorporation under due process. Then they have the two appellant's briefs as well.
Take the time to read all of these briefs. You won't be disappointed!