I.D.E.A. International Dialects of English Archive
With roughly 1,300 samples from 120 countries and territories, and more than 170 hours of recordings, IDEA is now the largest archive of primary-source recordings of English-language dialects and accents as heard around the world.
This site is CONSTANTLY getting updated with new recordings, just take a look at their "What's New" page. Need to learn an accent? You won't find a better resource than this.