American Institute of Chemical Engineers - http://www.chemicalonline.com/storefronts/aiche.html
CCINFOweb: with ChemInfo and MSDS (for CNC users only) - http://www.cnc.bc.ca/library/journals.html
Cheminformatics site (Trinity University) - http://hackberry.chem.trinity.edu/
Chemistry Index - http://www.claessen.net/chemistry/
Chemistry Societies Network - http://www.chemsoc.org
General Chemistry Online: introductory college chemistry lecture guides, tutorials - http://antoine.frostburg.edu/chem/senese/101/
Martindale's Grad & Undergrad Centre: chem & math - http://www-sci.lib.uci.edu/~martindale/Ref.html
Organic Chemistry - http://edie.cprost.sfu.ca/~rhlogan/organic.html
Periodic Table of Elements, Comic Strip Style! - http://www.uky.edu/Projects/Chemcomics/
Spark Notes chemistry study guides (Harvard) - http://www.sparknotes.com/