MSDS Solutions - MSDS sheets, material safety data sheets
Agway Energy Corp. MSDS
American Chemical Society
Canadian Centre For Occupational Health and Safety
Case Western University
ChemFinder (Search by Chemical Name, Formula, or CAS Number)
ChemFinder Searching
Chemical Abstracts Service: A Scientific Information Resource
Chemical Industry Institute of Toxicology
Chemical Warfare Agents
Chemical Weapons MSDS Sheets (Declassified)
Chemistry Information on the Internet (links)
Cleaning Supply Database
Cornell (Search by Chemical OR Trade Name)
CS Chemfinder Webserver
Dojindo Company MSDS
Drug Database Generic and Brand Name Drug Data from Pharminfonet
Dupont Intermediates MSDS
EnviroLink
EnviroNet (Searchable)
Environment and Safety Data Exchange (ESDX)
EPA - Chemical Substance Factsheets
EPA Toxic Substances Data Sheets
ERDEC Safety Office MSDSs
Eviro-Net MSDS
EXTOXNET, Extension Toxicology Network Pesticide Information Profiles and Toxicology
Fisher Scientific
gopher://atlas.chem.utah.edu:70/11/MSDS
gopher://ecosys.drdr.virginia.edu/11/library/gen/toxics
Hazardous Chemical Database
Hazardous Chemical Database at U of Akron
Index of /MSDS/D - Chemical and Other Safety Information
Internet Chemical Resources - Databases (links)
John Manville MSDS
Kodak MSDS
Macquarie University
Macquarie University, Australia MSDS Search
Martindale's Health Sciences Guide
Material Safety Data Sheets 
MIT
Mobile Corp. MSDS
MSDS and EPA Data Sheets for Pyrotechnic Chemicals
MSDS Online
MSDS-SEARCH
National Toxicology Program index from the NIH
NFPA Chemical Hazard Label codes from MSU
NFPA codes for common liquids
NWFSC MSDS Search
Oregon State System of Higher Education MSDS
OSHWEB: Chemical safety: MSDS
Periodic Table Database
Pesticide Information Profiles
Public Health & Safety Section (Yahoo)
Pyrotechnic Chemicals by John Ray
Seton's MSDS Online Library
Stanford Hazardous Materials Index
TEXT-Trieve Online MSDS Resource Project
ToxFAQs - Hazardous Chemicals Index from the USPHS
Univ of Kentucky MSDS Locator
Univ of Missouri - Rolla
University of Utah, Chemistry Department MSDS index
Utah MSDS
Vermont SIRI - MSDS
Vermont SIRI (Searchable - Best MSDS Resource)
VWR Scientific MSDS
Where to find MSDS on the Internet
Xerox Corp. Product MSDS
MSDS Binders & Accessories