I agree the MP3's and internet combined to spark more interest in old time radio shows. The internet made so many shows available free. There is one website a friend sent me last week that has over 40,000 free shows named Radioechoes.com.
For OTR fans that don't like to fool with downloads I have found a few OTR dealers that sell MP3 CD's. I have bought from several dealers and there are some dealers on ebay that are very cheap, but won't name names unless someone asks me, since I have no financial interest in any of them.
I also agree that after awhile, you want to hear something besides music on a MP3 player. One show I really like is the CBS Radio Workshop. Some shows are scripted but some are an early form of reality radio, for example The Voices of New York, which makes you feel like you were there about 57 years ago.