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The Arabidopsis Book (American Society of Plant Biologists)

Botanicus Digital Library Botanicus is a freely accessible, Web-based encyclopedia of historic botanical literature from the Missouri Botanical Garden Library.

Cold Spring Harbor Protocols (methods in molecular and cell biology)

Cold Spring Harbor symposia on quantitative biology: 70 year symposia archive

Current Protocols (CP) series from Wiley InterScience:
Current Protocols in Cell Biology
Current Protocols in Cytometry
Current Protocols in Human Genetics
Current Protocols in Immunology
Current Protocols in Molecular Biology
Current Protocols in Neuroscience
Current Protocols in Nucleic Acid Chemistry
Current Protocols in Protein Science
[Note: Only those CP titles listed above are available]

Current Topics in Developmental Biology
Current Topics in Membranes

Dictionary of Natural Products (database of chemical, physical, and biological properties of compounds)
Encyclopedia of Biological Chemistry

Encyclopædia Britannica Online
Encyclopedia of Life Sciences
Encyclopedia of Molecular Biology

Handbook of Statistics
Harper's Illustrated Biochemistry (27th ed.)

Knovel Library (interactive sci-tech reference

Laboratory Techniques in Biochemistry and Molecular Biology
Lange's Handbook of Chemistry

The Metabolic & Molecular Bases of Inherited Disease (8th ed.)
Methods in Cell Biology
Methods in Enzymology
Methods in Microbiology

BioMedProtocols (book series from Humana Press):
Methods in Molecular Biology
Methods in Molecular Medicine

Modern Applied Biostatistical Methods: Using S-Plus

Nature Protocols (interactive online resource for experimental and laboratory protocols)
NetLibrary (Nylink affiliated library collection -- title list; plus 3,000+ publicly accessible eBooks)

Quick Start Guide for NetLibrary

New Comprehensive Biochemistry

Oxford English Dictionary: OED Online
Oxford Reference Online: Premium
(language and subject reference works published by Oxford University Press -- title list)

University of Pennsylvania Libraries -- 30,000 free books on the web

Primers in Biology series from New Science Press:
Protein Structure and Function
Progess in Brain Research
Progress in Medicinal Chemistry
Progress in Nucleic Acid Research and Molecular Biology

Universal Digital Library (Million Book Collection -- multi-subject; English and non-English)

Vitamins and Hormones