Periodic Tables
Chemical Elements.com
Online interactive periodic table of elements
Chemicool
Online periodic table of elements
Visual Elements
The Royal Society of Chemistry's Periodic Table gives a visual representation of each element 
Web Elements Periodic Table
This scholar edition co-sponsored by the University of Sheffield in England claims to be the first Periodic Table on the Web.  It has sound bites for pronunciation of the element's name and a brief description of the element.
Environmental Chemistry
This periodic table is published by the Environmental Chemistry.com
Interactive Periodic Table  (Making Sense of Science)
Interactive Table that not only gives an element's atomic number & weight plus state at room temperature - it also lists its common usages.  (from Bayer)
Periodic Table of Elements
This Periodic Table is published by the Los Alamos National Laboratory as a resource for elementary, middle and high school students
It's Elemental
This site from the Thomas Jefferson National Accelerator Laboratory includes the Periodic Table of Elements but also has links Element Hangman, Concentration, Matching and Math games (Javascript required) as well as a printable Bingo cards or a word search puzzle. 
Theodore Gray's Periodic "TABLE"
Constructed of 2 inch thick walnut board and other materials, the result is very interesting.  Click through each table's elements to learn more.
1001 Periodic Table Quiz Questions and Links 
Interactive Quizzes for grades 3 through 12.

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Updated June 08, 2006