Conciding with the USGS National Map User Conference, the USGS is inviting developers and mashup artists to mashup their data or show off the National Map data products in some innovative ways or in clever web services. . About the event… The National Map Users Conference 2011 will feature a ‘mashathon’ for developers, managers, users, etc. to showcase The National Map data, products, services, and viewers in use. A geospatial ‘mashathon’ is similar to “map galleries”, just digital mashup galleries. Submissions can be live or in ‘beta’, working demo or screenshots, maps or applications, in your favorite tools or in The National Map Viewer. Submissions can be web applications, geoprocessing tasks, mobile applications, maps – anything showing The National Map data, services, or applications in use. Submit your entries HERE at http://ngp.ideascale.com/ or See also rules and entry information
See official announcement HERE – Submission and Voting Ends May 12th at 12PM Mountain Time.