Ideological Origins of the American Revolution Websites
Revolutionary Documents
Indiana University offers scanned images of many pivotal primary source documents, including the Stamp Act, a letter from John Hancock concerning the dissemination of the Declaration of Independence, and the first page from Tom Paine's The American Crisis pamphlet.
Primary Sources on the Revolutionary Era
The Avalon Project at Yale Law School has compiled several critical primary-source documents, including the Albany Plan of Union (1754), the repeal of the Stamp Act (1766), and state constitutions.
By the General's Own Hand
The Library of Congress has made electronic versions available of the papers of George Washington.
Jefferson's Works
Plus, they've included Jefferson's papers, too.
The Works of the Adams Family
The papers of John and Abigail Adams and the Adams family.
It's All About the Benjamin(s)
Here you'll find a thorough compilation of Benjamin Franklin's papers.