Here's a preview of the first:- British Library Sounds
British Library Sounds is a collection of archival sound recordings. Case-studies offer quick podcasts about different aspects of the collection. Try Emily Worthington, a music researcher, or Paul Long on jazz. Other podcasts desribe working on accents and dialects. Click here then choose an enthusiast!
Example of recent query: Enquirer wanted to know about an early record label. British Library Sounds had several podcasts by an expert in recording history.
FYI: Podcast of a visit to the British LIbrary Sound Archive