Our friends and colleagues who look to the stars:
The New Hampshire Astronomical Society

Track satellites, space stations and much more:
Heavens-Above

NASA sites:
NASA Education - For both kids and educators
Human Spaceflight - Space Shuttle, Space Station, behind the scenes of human spaceflight
The Hubble Space Telescope - Galleries and discoveries
Kennedy Space Center - All human spaceflight launches
The Jet Propulsion Laboratory - California Institute of Technology
John H Glenn Research Center - Spaceflight systems, propulsion, communication...
Ames Research Center - From small spacecraft to supercomputers...
Mars Exploration Rovers - Where are Spirit & Opportunity now?

Astronomy information :
The Nine (Eight) Planets - Information on all the planets and their moons
Bad Astronomy - Find out if it is astronomy fact or fiction
Space Weather - Aurora updates

Astronomical images:
Astronomy Picture of the Day
Space Telescop Science Institute
Hubblesite.org Image Gallery

Build your own space models:
Galileo model