Here's a great podcast all about Ottoman history. It includes episodes on the Tanzimat reforms, Islam in West Africa, the Indian Ocean, and art of the Quran, to name just a few.
You can stream some of the recent episodes online but you have to play older episodes on iTunes where you can also subscribe to the podcast.
Most of the podcasts run about 30 minutes.
In the art of the Quran, the host takes you through the Freer Sackler Museum exhibit which closed in October last year.
And the podcast about Islam in West Africa begins with a discussion explaining how Islam came into West Africa.