From the press release:
The Open Data Index is a community-based effort initiated and coordinated by the Open Knowledge Foundation. The Index is compiled using contributions from civil society members and open data practitioners around the world, which are then peer-reviewed and checked by expert open data editors. The Index provides an independent assessment of openness in the following areas: transport timetables; government budget; government spending; election results; company registers; national map; national statistics; legislation; postcodes / ZIP codes; emissions of pollutants.
Countries assessed (in rank order): United Kingdom, United States, Denmark, Norway, Netherlands, Australia, Finland, Sweden, New Zealand, Canada, Iceland, Moldova, Bulgaria, Malta, Italy, France, Austria, Portugal, Slovenia, Switzerland, Israel, Czech Republic, Spain, Ireland, Greece, Croatia, Isle Of Man, Japan, Serbia, Russian Federation, Ecuador, South Korea, Poland, Taiwan R.O.C., China, Indonesia, Hungary, Brazil, Germany, Mexico, Jersey, Guernsey, Slovak Republic, Bermuda, Romania, Costa Rica, Bangladesh, Tunisia, Singapore, Lithuania, South Africa, Cayman Islands, Egypt, Nepal, Senegal, Saudi Arabia, Nigeria, Gibraltar, Belgium, Hong Kong, Barbados, Bahamas, India, Bahrain, Yemen, Burkina Faso, Kenya, British Virgin Is., Saint Kitts & Nevis, Cyprus.