The American Law Institute (ALI), http://www.ali.org/, is an important and influential body that works on diverse projects designed to help develop law in the United States.
The ALI is best known for drafting treatises, called the Restatement of the Law, on different subject areas of law. The Restatements are repeatedly cited and relied on by courts and attorneys.
An exciting and important new development is just starting at the ALI. The ALI accepted a proposal, primarily drafted by Professor Matthew Fletcher of Michigan State Law School I think, to draft the first Restatement of the Law of American Indians.