This site contributed an article with details on the space elevator hoop variant.
Spacex Falcon 9 rocket launch has been delayed from summer 2009 into 2010 because of delays complying with air force regulations.
21st Century waves discusses how useful Mercury could be in the future development of the solar system. It has excellent solar power density and is mostly a big hunk of iron.
Centauri Dreams looks at growing interstellar probes using nanotechnology
Check out the Carnival of Space 105 at Discovery Space for a lot more