Scottish podcaster Andrew MacDiarmaid, a Scotland native currently living near Seattle, has a great website with many ways to listen to his entertaining and educational episodes. Some of the topics include tartans, Scots in America, pioneers in Scottish medicine, sports in Scotland (pt. 1 & 2), Scottish poetry and song, all with a few musical interludes sprinkled in here and there.
The show is also syndicated on the Celtic Radio Network, an award-winning internet radio station broadcasting Celtic music 24 hours a day. Listen to the show on Mondays and Wednesdays at 11:30am and Saturdays and Sundays at 2pm (Eastern Time).