Other
University of Siegen: An Exothermic Reaction
The University of Siegen provides a lovely exothermic reaction shown by four large photos. Sodium peroxide and zinc powder with a touch of water.
Other
Msd Hyper Glossary: Exothermic and Endothermic
This site from the Interactive Learning Paradigms discusses and defines exothermic and endothermic reactions. Further information is given under the definitions along with several links to additonal information. An interesting site.