Few links:
http://www.space.com/hubble
http://spaceflightnow.com/news
http://www.astronomy.com
http://earthfiles.com/news
http://homeearthlink.net/~dexxxa
http://www.rednova.com/news
http://jpl.nasa.gov
http://www.arcoscielos.com/gallery
http://www.astronautix.com
http://www.crytodesk.com
http://photojournal.jpl.nasa.gov/catalog