NASA Data
Astronomical Data Center: http://nssdc.gsfc.nasa.gov/adc/adc.html (National Space Science Data Center)
Eyes on the Solar System - http://solarsystem.nasa.gov/eyes/
Global Change Master Directory--NASA (to data sets) http://gcmd.nasa.gov/
National Space Science Data Center http://nssdc.gsfc.nasa.gov/
Planetary Science Research Discoveries http://www.soest.hawaii.edu/PSRdiscoveries/, also hands-on classroom activities in planetary science... http://www.soest.hawaii.edu/spacegrant/class_acts/
Policy and Plans--Space Summit Update http://www.hq.nasa.gov/office/codez/updates.html
Procurement home page: http://www.hq.nasa.gov/office/procurement
Satellite Passes:
Solar Energy Data http://eosweb.larc.nasa.gov/DATDOCS/Surface_Solar_Energy.html
Solar System Data
Solar System Dynamics Group at JPL--ephemerides--http://ssd.jpl.nasa.gov
Welcome to the Planets (JPL) http://pds.jpl.nasa.gov/planets/
Spaceflight--The Basics of Spaceflight Learners' Workbook http://www.jpl.nasa.gov/basics/
Spacelink: http://spacelink.msfc.nasa.gov ftp, telnet and gopher: spacelink.msfc.nasa.gov