I recently came across an article written by Roger Billings in the Encyclopedia of Chemical Technology.
Titled "Hydrogen Energy" focuses on the state of the technology and ways that hydrogen is making headway due to its higher efficiency rates -- basically: use the energy better, you need less of it, and it costs you less.
About the Encyclopedia: Written by prominent scholars from industry, academia, and research institutions, the Kirk-Othmer Encyclopedia of Chemical Technology presents a wide scope of articles on chemical substances including their properties, manufacturing, and uses. It also focuses on industrial processes and unit operations in chemical engineering, as well as covering fundamentals and scientific subjects related to the field. Additionally, environmental and health issues concerning chemical technology are also addressed.
The article is available through the Wiley Online Library:
Hydrogen Energy by Roger Billings