Dialectology

Linguistic Atlas Projects - Comprehensive information on linguistic dialect atlas projects across the U.S. including access to some data.
http://us.english.uga.edu/

Linguistic Innovators: The English of Adolescents in London - Quantitative sociolinguistic research among young Londoners studies changes in mainstream speech and how linguistic features spread. Includes description of project and research articles.
http://www.lancs.ac.uk/fss/projects/linguistics/innovators/index.htm

Good Practice Guide to Dialectology - Introduction to Dialectology by Dr. David Britain including a bibliography and related links.
http://www.lang.ltsn.ac.uk/resources/goodpractice.aspx?resourceid=964

International Society for Dialectology and Geolinguistics - Official site promotes dialectology and geolinguistics and features membership and publication information for the International Journal of Dialectology and Geolinguistics.
http://www.uni-bamberg.de/romling1/sidg/

New Zealand English - Resources on social dialect studies in New Zealand.
http://www.ualberta.ca/~johnnewm/NZEnglish/home.html

University of Copenhagen Dialectology - Overview of research and resources on Danish dialectology.
http://english.dialektforskning.ku.dk/

Harvard Survey of North American Dialects - Results of an online survey of regional pronunciations of American English
http://www4.uwm.edu/FLL/linguistics/dialect/index.html

Dialect Topography - Interactive results of a sociolinguistic postal survey of dialect variants in eastern Canada and northeastern United States.
http://dialect.topography.chass.utoronto.ca/

Sociolinguistics - Informational page on sociolinguistics with a very large section on dialects.
http://www.unc.edu/~gerfen/Ling30Sp2002/sociolinguistics.html

Dialectology - Dialectology section has general information as well as papers, links, and information on Norwegian, Dutch and German dialects.
http://odur.let.rug.nl/~heeringa/dialectology/

Estuary English Resources and Information - Estuary English resource page includes many links to research and articles about a variety of English spoken in the areas around the river Thames and its estuary.
http://www.phon.ucl.ac.uk/home/estuary/home.htm

The Cambridge Online Survey of World Englishes - Online language survey collects English dialect features from site visitors and publishes results on dialect maps.
http://www.ling.cam.ac.uk/survey/