Mine at the moment:
Radio Freetown, which is basically just a guy playing loads of vinyl of really amazing African pop from the 70s.
London Calling, which is a bunch of old BBC World Service shows by Saint Joe Strummer.

This American Life and the New Yorker Fiction one are great also.

What you lot into at the moment? Aside from comedy ones, which would cause an avalanche of ADAMS AND JOES (but yeah, y'know..Adam and Joe)