The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February of 2000.

lenehey writes "A new free iPhone app provided by NASA was released today. The app lists each of NASA's missions, and allows you to see a brief description, the latest news updates, images, videos, etc., corresponding to that mission. A timer is also provided for each mission, logging the days, hours, and seconds until (or since) the mission launch."
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The International Space Station (ISS) was in position to view the umbral (ground) shadow cast by the Moon as it moved between the Sun and the Earth during the solar eclipse on March 29, 2006.

WW2D is cross-platform, free and open-source application similar to NASA World Wind or Google Earth software.