Abbreviations of Chemical Compounds
Type in an abbreviation or the name of a chemical compound and get the full chemical compound entry.
http://www.chemie.fu-berlin.de/cgi-bin/abbscomp

Biophysical Journal
An expanisve collection of articles concerning the many areas of science. Including chemistry, biology, physics, neurscience, and many other options:
http://www.biophysj.org/

CiteSeer
Scientific Literature Digital Library
http://citeseer.ist.psu.edu/

Scirus
A scientific saerch engine, that allows one to search both journal and web resources, which offer a multitude of resoucres in the various fields of science.
http://www.scirus.com/srsapp/

Sheffield ChemPuter
A set of simple interactive calculators for chemistry hosted by the University of Sheffield (isotope patterns, element percentages, reaction yields, oxidation state, electron accountancy, VSEPR, and MLXZ).
http://www.shef.ac.uk/chemistry/chemputer/

109: The Visual Elements Periodic Table
An interactive table of all 109 elements, with links to an image, history, and description of each element. More details about each element, including uses, biological role, physical information, and key isotopes, are available in PDF files, which may be viewed using the free Adobe Acrobat Reader.
http://www.chemsoc.org/viselements/pages/periodic_table.html

WWW Virtual Library: Chemistry
Links to chemistry sites, organized by type of site from academic institutions and nonprofit organizations to commercial ones.
http://www.chem.ucla.edu/chempointers.html