Royal Society of Chemistry
Visual Elements/history
A history and description of the modern periodic table, including its early origins, many contributors and later additions.
Other
Moscow University: Dmitriy Mendeleev Online
This site from Moscow University contains links to other Mendeleev sites. Links are categorized by the following topic areas: Overviews, Writings, Pictures, Periodic Laws, Periodic Tables, and Russian resources.
PBS
Pbs: Dmitri Mendeleev
A brief outline of Mendeleev's life from PBS. Not much information, but does hit upon the highlights of his life.