The WWW Chemistry Guide is a comprehensive collection of annotated links for chemists and researchers involved in organic, biochemical, computational, medicinal and/or other chemistry research. All sites listed in the directory are examined by our team of editors (scientists with Bsc, Msc and Ph. D. degrees of chemistry), and only if qualified are granted inclusion. Editorial review ensures that all sites are appropriately listed in their most relevant category; all sites included must contain substantive unique content, navigate in a user-friendly manner, contain no broken links or pictures, be up and running 24/7, and conform to universally accepted web standards.