http://www.atomflowers.com/
Flower~like images of s, p, d, and f orbitals plus basic information on each atom

http://dmoz.org/Science/Chemistry/Periodic_Table/
List of links to many different periodic tables

Chemistry Coach Periodic Tables
List of links to basic, advanced, or unusual periodic tables

http://www.webelements.com/
One of the best interactive periodic tables on the web!

http://chemlab.pc.maricopa.edu/periodic/periodic.html
Pictorial periodic table: lots of information and element images

http://www.ilpi.com/genchem/periodicquiz.html
The Periodic Table Challenge....test your knowledge of where the elements are on the Periodic Table