Canadian Museum of History
Canadian Museum of History: Maya Civilization
Lots of information about many facets of the Maya civilization. Covers the history, people, geography, languages, cities, society, cosmology, the calendar, and lots more. Includes a glossary and a timeline.
Other
The Maya Calendar: A Converter
Gives the Mayan days and months. In addition, a Java Applet is included which will convert any date (Gregorian calendar) to its corresponding Mayan date.