David Kopel has been doing a good job of keeping up with the Amicus Briefs supporting Heller in DC v Heller. He has been writing a brief synopsis of each brief as they are filed and posting the comments on The Volokh Conspiracy.
We are in interesting company.
I have not yet read all of the briefs, but I will. As a matter of fact, I hope they come out in book form as what I have read so far is a great study on the Second Amendment.
You can find a listing of each Amicus Brief along with a quick overview here.