Sigma-Aldrich MSDS search 

Principal functions and activities: Multi national chemicals manufacturer
Site Content: Free MSDS search facility.

The MSDS Search National Repository

Principal functions and activities: MSDS-SEARCH is designed to be a reliable starting point for the exchange of MSDS documents - a single contact point for suppliers and users of MSDSs where both parties are assured that the MSDSs exchanged meet the requirements of being "the most current document" and "from the manufacturer.
Site Content: MSDS search facility and other chemical industry information.

UK Health and Safety Executive

Site Content: A large site containing a vast amount of information. 

HMSO

Site content: Full text of all legislation enacted by the UK Parliament since 1988.

THE HEALTH AND SAFETY AUTHORITY -IRISH REPUBLIC

Site Content:  Health and safety information relating to the Irish Republic.