A General Chemistry Project of the ACS
The American Chemical Society has launched an activities-based, student-centered approach to the general chemistry course, a textbook covering all the traditional general chemistry topics but arranged in a molecular context appropriate for biology, environmental and engineering students.
http://bcs.whfreeman.com/acsgenchem/

ACS Division of Chemical Education
ACS Division of Chemical Education provides a common ground for teachers and students of chemistry to examine chemical education in its broadest sense. DivCHED serves as a means of focusing and enhancing the interests and efforts of all constituencies involved in the teaching and learning of chemistry at every level.
http://www.divched.org

Chem4Kids
Chem4Kids is a site designed to teach the fundamentals of chemistry to anyone. Learn about matter, elements, and where you'll find them in the world around you. Also learn about atoms, math, chemistry tricks, and more. It's meant for beginners, so students and teachers should find useful subject material inside.
http://www.chem4kids.com/

Chemguide
Designed to help students understand concepts of chemistry. Contains information that is both relevant to the higher and advanced higher courses. Topics include Atomic Structure and Bonding, Inorganic and Organic Chemistry, Instrumental Analysis, Organic Reaction Mechanisms, , and Chemistry Calculations.
http://www.chemguide.co.uk/

Chemical Educational Foundation
The Chemical Educational Foundation (CEF) is a national non-profit organization that promotes the importance of chemistry, chemicals, and chemical safety awareness education. Created by the National Association of Chemical Distributors, CEF provides communities with programs and publications that educate on the benefits of chemicals and chemistry education. These programs include a fun chemistry kit for grades K-8, a chemistry competition, and consumer bulletins.
http://www.chemed.org

Chemistry PowerPoint Lessons and Resources
Hundreds of files for download: PowerPoint presentations and PDF labs, notes, and worksheets. Most topics from high school chemistry are represented, including atomic structure, bonding, equilibrium calculations, gas laws, nomenclature, organic chemistry, stoichiometry, etc.
http://www.chalkbored.com/lessons/chemistry-11.htm

Chemtutor
A collection of materials by David Wilner: "Basic chemistry help is available here for high school or college students. Chemtutor begins with the fundamentals and gives expert help with the most difficult phases of understanding your first course in chemistry. Chemtutor is not necessarily a complete text for your course or a complete outline, but we are proud to offer some insightful help in the parts of primary chemistry that have been, from our experience, the hardest for students to grasp."
http://www.chemtutor.com

Journal of Chemical Education
The Journal of Chemical Education is the journal of the Division of Chemical Education, Inc. of the American Chemical Society. Published continuously since 1924, JCE is the world's premier chemical education journal. It mission is to help chemistry teachers stay current with research advances as well as share new ideas in teaching methodologies and course organization. A multimedia publisher, JCE welcomes materials in print, software, video, and other digital formats.
http://jchemed.chem.wisc.edu

Molecular Modelling for Organic Chemistry
Course of eight lectures and lecture-demonstrations which aim to introduce in a simple way the hierarchy of computational modelling methods used as standard tools by organic chemists for searching for, rationalizing and predicting structure and reactivity of organic, bio-organic and organometallic molecules.
http://www.ch.ic.ac.uk/local/organic/mod/

The Center for Professional Advancement
Providing high-quality continuing professional education to industry and government worldwide for 40 years. Over 450 training courses in 19 applied industrial technologies including: analytical training, pharmaceutical training, biotechnology training, chemical engineering training, and medical device training as well as regulatory compliance training: GMP training, GLP training & GCP training.
http://www.cfpa.com

The ChemCollective
The site consists of learning activities, workshops and discussions of teaching and learning chemistry. The activities include virtual laboratory problems, real-world scenarios, concept tests and simulations. Students can run the Virtual Lab and download or run the activities on the site. Help on how to use the site and links to related projects are provided.
http://www.chemcollective.org

The Chemical Forums
Discussion boards for all areas of chemistry, at levels ranging from high school to graduate school and practicing chemists. Site also includes web directory, periodic table, articles, and reference tables.
http://www.chemicalforums.com

The Chemistry Hypermedia Project
The specific goals of this project are: to use the internet to provide supplemental educational resources to chemistry students, determine effective hypermedia designs for chemical education, evaluate the distribution of multimedia educational material over the internet and develop, evaluate, and disseminate prototype programs for creating interactive exercises.
http://www.chem.vt.edu/chem-ed/

Virtual Chembook
This nicely-done site by Charles Ophardt of Elmhurst College covers a wide swath of general, organic, and environmental chemistry. The text material is interesting and well written without attempting to be encyclopedic.
http://www.elmhurst.edu/~chm/vchembook/index.html