Interesting links:
Biology Dictionary - Biology-Online.orgChemical and Other Safety Information, from the Physical Chemistry Laboratory, Oxford University
European Chemicals Agency ( ECHA )
EPO, European Patent Office
Google chemistry site
INCHEM, Chemical Safety Information from Intergovernmental Organizations
Periodic table
Scirus - search engine for scientific information
Survey of azo-colorants in Denmark, Danish Environmental Protection Agency
USPTO, United States Patent and Trademark Office