Space

NASA

• The National Aeronautics and Space Administration
• Jet Propulsion Laboratory
• NASA's Planetary Photojournal
• Eyes on the Solar System
  

Nasa Space Missions

• DAWN - Mission to asteriods Ceres and Vesta
• New Horizons - Mission to Pluto and beyond
• JUNO - Mission to Jupiter
  
• Messenger - Mission to Mercury
• Mars Exploration Rover Mission
• Lunar Reconnaissance Orbiter
• Cassini Equinox Mission - Titan and Saturn Orbital
• Constellation - NASA's new launch System
• Kepler - Mission to search for extrasolar planets
  

Astronomy

• Astronomy Picture of the Day
• Hubble Optical Space Telescope
  
• Hubblesite Hubble photos
  
• James Webb Infrared Space Telescope

Roscosmos

Seti@home

• Seti@home
• US Distributed

Commercial Space Launch

• Space X
• Orbital Sciences Corporation
• Virgin Galactic
• Blue Origin
• Bigelow Aerospace

Space Related

• NASA - Curiosity Cam building the next Mars Rover
• NASA - KSC Video Feeds
• NASA - James Webb Telescope Webcams
• NASA - Image of the Day RSS
• James Webb Infrared Space Telescope Webcam
  

Space News

• Space.com
• Space Daily
  

Space Related

• Orbiter ( free launch and orbit sim )
• Parabolicarc.com/ - Space Blog

Hobbyist Rocketry

• LUNAR
• Derek Deville ( Homemade Rockets )
• Tripoli Rocketry Association inc.