Research Methodologies - a glossary of terms
http://scansw.com.au/sc_pages/sc_soccultwld/sc_meth_glossary.html

P129-138 in Sociology: A Graphic Guide, Osborne & Van Loon (Excellent reading!)

More on research: Focus group, participant observation, and content analysis
http://scansw.com.au/sc_pages/sc_soccultwld/sc_haylarveal_meth.html

Sociology for students website: http://www.sociologyguide.com/basic-concepts/index.php