The Grounded Theory Method (GTM) has generated a large number of web sites that you might explore to learn more about this approach to field research.  Here are a few to get you started.  Many of the sites listed below will point you toward other sites.

Grounded Theory on the Web "dedicated to the evolving methodology of Dr.Barney G. Glaser, Ph.D" 
    http://www.sociologypress.com/soclinks.html

Grounded Theory Methodology on the Web by  Karl Freiherr von Manteuffel
    http://www.geocities.com/ResearchTriangle/Lab/1491/gtm-19.html

Grounded Theory Methodology by the Open Directory Project
    http://directory.netscape.com/Bookmarks/R/rms46/Grounded_Theory_Methodology

More Grounded Theory Methodology on the Web
    http://www.vlsm.org/gnm/gtm-32.html

The Grounded Theory Institute
    http://www.groundedtheory.com/

References on Grounded Theory
    http://www.auckland.ac.nz/msis/isworld/grndrefs.htm