A beautiful example of this trend is the Archival Sound Recordings page at the British Library has a neat

Pictured is a screen shot of the Accents and Dialects sound map, featuring "700 recordings from the Millennium Memory Bank and the Survey of English Dialects." Clicking on a balloon brings a popup with information about the interviews available from that location. Clicking on an interview description takes you to a new window with an audio player and metadata. Also available in this mapped format are wildlife and soundscape recordings from Britain, music from India and Uganda, and a whole mess of noisy frogs.
You can read more about the Archival Sound Recording Project here or on the project blog. This post comes via the JISC Digitisation blog.