NASA apparently has over 1.8 million images of Earth taken by astronauts on the International Space Station and needs help cataloging what the images represent. Properly cataloged images can be used to track changes in the Earth over time (such as glacier melts, deforestation, etc.)
After taking a quick tutorial (~7 min) on how to choose an image and overlay it on Google Earth to find its center, you register with the site and can get started identifying locations of landmarks photographed from space. The website is easy to use if you've done any image processing. It mostly consists of rotating and resizing images.
I only started 2 days ago but I'm already addicted. So far I've identified sections of the Colorado river, Venice, Acapulco, Kauai, Crete, atolls in the pacific, the Golden Gate Bridge, St. Louis, Pensacola, and the Grand Canyon. The images are really beautiful and you never know when you click one what part of the world it represents. (The site centers your google earth view over the spot the ISS was at the time the picture was taken, so you don't have to search the entire globe to find where the pictured volcano is.)
It's interesting, free and (supposedly) actually useful to scientists.
And for you competitive types there is a leaderboard.
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