Accents of English
Listen to the main existing corpora on different accents of English.
English Intonation in the British Isles
The speech accent archive
International dialects of English archive
Listen to words and phrases in different English accents
Youglish
Forvo
Recordings of English accents, Barry Pennock-Speck
Recordings of English accents, John Wells
Learn about sound change and accent variation with the following lectures and blogs.
Variation in Speech, P. Roach
Accent variation, M. Huckvale
Current British English (CUBE), G. Lindsey
Whatever happened to RP, J. Wells