One of the first groups to take to podcasting were museums and art galleries. Several let you download guided tour information before you visit.
I recently read about how the Isabella Stewart Gardner Museum in Boston is using podcasts to let us all share their classical music concerts. The museum is tied down fairly tightly by their charter, and can't make a lot of changes to the building or displays. But they've clearly found other ways to innovate.
The really interesting part is that the podcasts are bringing them a whole new audience, with as many as 40,000 downloads a month. Wow. Good for them.
"An Unlikely Story: tech where you least expect it", by Kathryn Tuggle, FastCompany February 2007.