University of California
University of California at San Diego: Aztec Chronology
An extremely detailed chronology of the Aztecs and their predecessors, stretching from 600 AD to 1521, their conquest by the Spaniards. Scroll to the end to find a genealogical chart of the Aztec royal house.
Foundation for the Advancement of Mesoamerican Studies
Famsi: Epi Classic Cultural Dynamics in the Mezquital Valley
Interesting study of artifacts used to demonstrate inter-regional trade in the Mezquital Valley area of Mexico during A.D. 600-1000. This work also offers good insights into specific cultures.
Other
Univ. Of Kansas: Toltecs: Lecture Notes
A set of lecture notes detailing the Toltec culture and civilization. These notes are part of a larger course covering the Mesoamerican civilizations.
Mex Connect
Mexico Connect: The Post Classic Period
This article includes a summary of Toltec culture and civilization. There is also a link to a timeline of Mexican history.