SpaceDaily (Popularity: )
http://www.spacedaily.com/ Comprehensive daily news resource on space science and industry. Includes updated overview of news from multiple sources.
SPACE.com (Popularity: )
http://www.space.com/ Provides updated space news, discussion boards, extensive photo galleries, and items for sale.
X-Prize News (Popularity: )
http://www.xprizenews.org/ News about X-prize contenders and events. Includes schedule of events. Updated regularly by a team of editors.