Science

http://anthro.palomar.edu/animal
http://animaldiversity.ummz.umich.edu/site/index.html

http://tolweb.org/tree/phylogeny.html  

The Tree of Life Web Project

http://www.ucmp.berkeley.edu/help/timeform.html

http://www.paleoportal.org/

http://www.enature.com/home/

http://www.scientificamerican.com/section.cfm?id=ask-the-experts

ChemEd DL Application: Periodic Table Live!