DARPA's awarding $40,000 to the first person or team to find ten red balloons which were spread all over the country on December 5th. The goal is to learn how people organized in large teams use computers to socially network. What software will we see? Will there be spying? Attempts to misinform other teams? I'm not clear how they will measure all they want to measure, but the prospects look very interesting.
December 5th was the 40th anniversary of Arpanet, the Internet's precursor.
HT: Alex Tabarrok
Update: Here are the results.