Merlot II Chemistry Community Portal
From California Institute of Technology, this site provides access to 3,817 Chemistry e-resources.
eMolecules
eMolecules empowers researchers to explore uncharted chemical and biological spaces and deliver more efficient drug-discovery programs.
ChemWeb.com provides access to the information chemists need to enhance their research, product development, self-development, education, and/or their businesses in Chemistry and related disciplines
ChemSpider
ChemSpider is a free chemical structure database providing fast text and structure search access to over 67 million structures from hundreds of data sources.
Encyclopedias are a great resource for gathering background information. They act as good starting points and are more authoritative than Wikipedia.