Here below are few links for companies/organizations involved in hydrogen:

The Danish hydrogen association: www.hydrogenlink.dk

Information site on hydrogen, teaching material, reports, politics etc.  www.hyweb.org    

The European Hydrogen Association: www.H2euro.org

Hydrogen stations around the world: www.h2stations.org/

Testing of hydrogen busses: HyFLEET:CUTE project

An international vision for Hydrogen and Fuel Cells

Hydrogen Energy Roadmap: www.hyways.de/

International Energy Agency (IEA)