In addition to the “Guide to Criminal Prosecutions in the United States” set forth below, http://usinfo.state.gov/usa/infousa, http://thomas.loc.gov/ and http://www.uscourts.gov/understand02/ provide general information about the United States and its legal system, including the courts.
The U.S. Department of State oversees the first site, Info USA; and the Administrative Office of the U.S. Courts maintains the second site on behalf of the federal judiciary. InfoUSA also provides links to State resources.