Unmanned Aircraft Systems (UAS) Registration Task Force (RTF), Aviation Rulemaking Committee (ARC): Task Force Recommendations Final Report [open pdf - 328KB]
"The Federal Aviation Administration (FAA) chartered the Unmanned Aircraft Systems (UAS) Registration Task Force (RTF) Aviation Rulemaking Committee (ARC) (Task Force) to provide recommendations to the FAA 'on registration requirements and process for small UAS, including those used for commercial purposes, and all model aircraft.' [...] The stated objective of the Task Force was to develop recommendations for the creation of a registration process, which ultimately would contribute to an enforceable rule imposed by the FAA. The FAA stated that the intent of establishing this registration framework was to promote a culture of accountability while achieving a maximum level of compliance."
U.S. Federal Aviation Administration: http://www.faa.gov/