Johnson Space Center
Established in September 1961 as NASA's primary center for: design, development and testing of spacecraft and associated systems for human flight; selection and training of astronauts; planning and conducting human space flight missions; and extensive participation in the medical, engineering scientific experiments carried aboard apace flights. http://www.jsc.nasa.gov/
National Space Society
Comprehensive overview with newsletters, member forum and activities of an US association to "advance the day when people will live and work in space". http://www.nss.org