Here are some interesting spots on the web for accents and dialects:

A sketch from the old Monty Python TV show - scripted but also highly improvised and very funny. The actors come from a variety of English regions and have somewhat differing accents.



This stand-up comedian has fun with one kind of Indian accent:



Interesting little video on Chicano English at this useful site. Click on the caption of the picture, "Chicano English." Also check out the little quiz.

http://www.pbs.org/speak/seatosea/americanvarieties/chicano/#

This woman is a gifted actress/mimic - she has mastered the sound of 21 different accents:



Jamaican Creole English: Interview with Bob Marley on benefits of marijuana:



Interesting video that explores and explains varieties of Spanish:



Here's a less serious but amusing effort to capture various Spanish accents:



Here we have a demonstration of one more dimension of language variety - generational separation. These Chilean teens are filmed speaking a (scripted) form of highly slangy Spanish:




Nigeria is a former British colony in West Africa that has developed its own form of Creole English:



Nice PowerPoint explanation of Hawaiian Creole English:

http://faculty.washington.edu/wassink/2006_sketches/Hawaiian.htm

Good mini-documentary on African-American Vernacular English:



Interesting example of a dialect originating in a particular form of employment:



Collection of audio files of various accents and dialects:

http://web.ku.edu/idea/index.htm

Gullah is a surviving early form, a kind of American Creole English, limited to a few islands, that gives some idea of African-American English prior to the long process of decreolization.

http://www.knowitall.org/gullahtales/tales/turtle/flash/index.html