The HTML version of IUPAC "Blue Book" Nomenclature of Organic Chemistry, Pergamon Press, Oxford, 1979 and A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications.
Organic Chemistry Resources Worldwide is an intuitive reference guide for synthetic organic chemists. The site is structured around the daily tasks an organic chemist has to perform.