The KCAP2013 Datathon invites submissions that demonstrate the value of Open Data through innovative applications. Objectives include to identify possible pitfalls along the value chain of the data, and second, to draw a number of conclusions that allow the communities involved in generating and exploiting large-scale data, to deal with such difficulties and flatten the ground for data-intensive applications in the near future.
On the Datathon page you can find information about the submission process, available resources, and the $2000 prize for the winner!
http://events.kmi.open.ac.uk/kcap2013/datathon/