The BBC Radio 4 (and World Service) programme "The Routes of English" is now into Series 4. This series looks pricipally at English around the world. It is worth installing real player, as there are now sound clips.
http://www.bbc.co.uk/radio4/routesofenglish/

I particularly liked hearing Bill Bryson in:
http://www.bbc.co.uk/radio4/routesofenglish/storysofar/programme4_1.shtml

and the discussion of 'Ocker':
http://www.bbc.co.uk/radio4/routesofenglish/storysofar/programme4_4.shtml