Sites

Development of Periodic Table (Popularity: )
http://mooni.fccj.org/~ethall/period/period.htm
briefly outlines the history of the systematic arrangement of the elements.

Brief History of the Development of the Periodic Table (Popularity: )
http://www.wou.edu/las/physci/ch412/perhist.htm
although Dmitri Mendeleev is often considered the "father" of the periodic table, the work of many scientists contributed to its present form.