ChemViz (Chemistry Visualization) is an interactive chemistry program which incorporates computational chemistry simulations and visualizations for use in the chemistry classroom.
http://education.ncsa.uiuc.edu/products/chemviz/index.html
The ChemSense software supports the sharing, viewing, and editing of a variety of chemistry representations.
http://chemsense.sri.com
Another Peridic Table
http://www.popsci.com/files/periodic_popup.html
Dynamic Periodic Table of Elements
http://www.ptable.com
Tables charting the chemical elements have been around since the 19th century - but this modern version has a short video about each one.
http://www.periodicvideos.com/index.htm