The American Revolution A good site, with sizable battle descriptions and biographies (although none of British figures), a timeline that runs up to 1788 and the full texts of a good selection of important documents.
The American Revolution The support site for the PBS series Liberty!, this site features sixteen essays examining different aspects of the period, as well as a good bibliography.
Revolutionary Wars in the News. A nice idea - a web site that keeps track of news stories related to the war of Independence.
Archiving Early America A very good collection of contemporary documents from 18th century America, including many that shed light on the battle for independence. Not yet a massive collection, but already very useful. Includes a very good collection of original maps.
George Washington's Mount Vernon The official site of Washington's house. Has a good selection of educational documents, and a nice tour of the house.