e-Biosphere '09 Challenge
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Not much information on the other entries yet, except for the eBiosphere Citizen Science Challenge, by Joel Sachs and colleagues, which will demonstrate a "global human sensor net". Their plan is to aggregate observations posted on Flickr, Twitter, Spotter, and email. It might be fun to make use of some of this for my own entry (by default already will, because we are both using EOL's Flickr pool).