LANL: Hydrogen
- Explains where hydrogen comes from, how it is used, and its potential for new energy applications.
- http://periodic.lanl.gov/elements/1.html

It's Elemental: Hydrogen
- Includes physical properties and information about the uses and history of hydrogen.
- http://education.jlab.org/itselemental/ele001.html

Chemical of the Week: Hydrogen
- Includes a collection of equations showing reactions between hydrogen and other substances.
- http://scifun.chem.wisc.edu/chemweek/HYDROGEN/hydrogen.html

ChemicalElements.com: Hydrogen
- Features basic information, an atomic structure diagram, facts and a table of isotopes.
- http://www.chemicalelements.com/elements/h.html

Wikipedia: Hydrogen
- Includes an article with pictures covering properties, applications, history, forms and safety precautions.
- http://en.wikipedia.org/wiki/Hydrogen