http://www.webelements.com
Excellent online interactive periodic table: click on any element and access a mass of information about it.

http://www.theodoregray.com/PeriodicTable
Fascinating, informative and extensive site describing the construction of a real wooden periodic table and the collection of elements to go into it.

http://www.chemsoc.org
Features "a visual interpretation of the table of elements" - graphically stunning, imaginative videos representing each element.

http://www.chemicalelements.com
Another good online periodic table

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