http://www.staff.uiuc.edu/~ehowes/main.htm.
This site is the project of an English instructor that teaches Business and Technical Writing classes at The University of Illinois at Champaign-Urbana, of all things! It’s not a bad site and seems like Joe Normal could understand and implement most of what he says. Includes topics on controlling mal-ware, securing email and protecting yourself while on the web (which has some pretty obvious things like “don’t download files from sites that you don’t know”).