Space physics:
http://www-pw.physics.uiowa.edu/links/space.html
http://www-ssc.igpp.ucla.edu/ssc/tutorial.html

Education:
http://www.sec.noaa.gov/Education/ed_sites.html
http://www-spof.gsfc.nasa.gov/Education/Intro.html

Textbooks:
http://www.oulu.fi/~spaceweb/textbook/
http://www.plasma.uu.se/CED/Book/
http://www-istp.gsfc.nasa.gov/istp/outreach/geospace.html
http://www.ace.mmu.ac.uk/eae/

Missions:
http://members.aol.com/gca7sky/mission3.htm
http://sohowww.nascom.nasa.gov/
http://sohowww.estec.esa.nl/
http://lasco-www.nrl.navy.mil/index.php
http://lmsal.com/solarsites.html
http://trace.lmsal.com/POD/TRACEpodoverview.html
http://www.srl.caltech.edu/ACE/
http://stp.gsfc.nasa.gov/missions/stereo/stereo.htm
http://www-spof.gsfc.nasa.gov/istp/wind/
http://sunland.gsfc.nasa.gov/smex/sampex/
http://ulysses.jpl.nasa.gov/
http://nssdc.gsfc.nasa.gov/space/imp-8.html
http://web.dmi.dk/projects/oersted/
http://www.gfz-potsdam.de/pb1/op/champ/index_CHAMP.html

Sun-Earth relationship:
http://www.sel.noaa.gov/index.html
http://www.spaceweather.noaa.gov/
http://www.estec.esa.nl/wmwww/wma/spweather/
http://spdf.gsfc.nasa.gov/space_weather/Space_Weather_at_SSDOO.html

Meteosat pictures: http://sas2.elte.hu/meteo
Pictures of the Week: sas2.elte.hu/tg/tgismcikk.htm