Lingthusiasm is an outstanding podcast about linguistics in general.  You can choose episodes by topics such as phonetics, morphology, phonology, syntax and more!  For example, in Episode 13: What Does it Mean to Sound Black?, the host Gretchen McCulloch interviews Dr. Nicole Holliday, an Assistant Professor of linguistics at Pomona College about her work on the speech of American black/biracial young men, prosody and intonation, and what it means to sound black.