Here are a few of the more interesting space related blogs and websites I frequently read. All have some inspiring and mind-blowing articles and images.
Astronomy Picture Of The Day. Also be sure to check out their archive for 14 years worth of images.
NASA Cassini Equinox Mission. Images of Saturn and its moons.
NASA JPL MER. Images from the Mars rovers.
Mars Reconnaissance Orbiter. Superb high res pictures of the surface of Mars from orbit.
STSI. Latest info and images from the Hubble Space Telescope.
TRACE and SOHO. Images of our nearest star.