ACD ChemSketch 12.0 Freeware (for educational use)
Free, comprehensive chemical drawing package for home and educational use only.

SciFinder Tutorials
Video tutorials and pdf How-to-Guides on searching references, reactions and substances.

Bioinformatics database

BRENDA: Comprehensive Enzyme Information System

RCSB Protein Data Bank

Additional resources:

American Society for Biochemistry and Molecular Biology (ASBMB)
Biophysical Society
Protein Society
American Chemical Society (ACS)
Community of Science
Web of Knowledge