US Government Publishing Office
Ben's Guide to u.s. Government: Powers Denied to the National Government and State Governments
Described in chart form are the powers not permitted for the national and state governments. A good comparison of the two types of government.
Thomson Reuters
Find Law: Powers Denied to the States
Resource explains how during the time of the Civil War the Supreme Court used Article I, Section 10, Clause 1 of the U.S. Constitution to show that the Confederation formed by the seceding States had no legal existence. The site also...