Links
Moles calculator [JavaScript features by Jon Glassman]. Helps you do various calculations related to chemistry.
http://www.chemsoc.org/crl/links.htm

Humour:
http://paul.merton.ox.ac.uk/science/administratium.html
New element discovered - administratium

Comic Book Periodic Table [Kentucky, USA]
http://www.uky.edu/~holler/periodic/periodic.html
Including "The Answer Man's interactive trivia quiz on chemistry and
comics".

Graphs of Atomic Scattering Factors for the elements [Uppsala, Sweden]
http://xray.uu.se/hypertext/ptable.html

chemsoc's Chemistry Resource Locator
useful links for chemists
http://www.chemsoc.org/crl/links.htm