Engine Manufactures
Briggs and Stratton: http://www.briggsandstratton.com
Tecumseh: http://www.tecumseh.com/engines.htm
Kohler: http://www.kohlerengines.com
Honda: http://www.hondapowerequipment.com

Equipment Manufactures
MTD Products: http://www.mtdproducts.com/corporate/index.jsp
Murray Inc: http://www.murrayinc.com
John Deere: http://www.deere.com
Lawn-boy: http://www.lawn-boy.com
Toro: http://www.toro.com/
Sears Parts Direct: http://www3.sears.com/intro.shtml
Snapper: http://www.snapper.com

Other
Cyberlawn, an informational site: http://www.opei.org/
No spill gas cans: http://www.no-spill.com/