chemistry.about.com - layman-oriented collection in the About Directory with helps on chemistry, science fair projects and maybe whatever is in the news
Links for Organic Chemistry - by the American Chemical Society’s Organic Division
Organic Chemistry Resources Worldwide - a collection directed at synthetic organic chemists
Rolf Claessen's Chemistry Index - An exhaustive site with many branches, uses and items of interest
entropysite.com - educational site maintained by Professor (Emeritus) Frank Lambert to foster a proper understanding of entropy as a dispersal of energy among available states, rather than the overplayed idea of disorder, largely through articles from the Journal of Chemical Education
Chemistry Guide - an excellent site to find a wide range of chemical information in the fields of organic chemistry, combinatorial chemistry, analytical chemistry, organometallic chemistry, inorganic chemistry, green chemistry, polymer chemistry, biochemistry and peptide chemistry
History of Chemistry - much of it in the words of the scientists themselves
Invent Now - National Inventors Hall of Fame - site dedicated to promotion of science, technology and invention