International Space University http://www.isunet.edu/
ISU is a educational organization in France providing courses in space technology internationally. Site provides extensive course programme info and overview of the school.
Mars 2012 http://mars2012.berkeley.edu/
A course with focus on Mars missions, offered by Berkeley University, USA. Includes course curriculum, news and support material.
Orbital Laboratory http://www.space-explorers.com/
Student designed experiment aboard the International Space Station. Students can monitor their payload and compare it to their own ground based control.
PCs in Space http://www.pcsinspace.com
A community outreach service in conjunction with NASA, providing free software to engender interest in space and science in elementary school children. Includes detailed descriptions and downloads.