I noticed while talking with friends that not too many people know about archive.org or assume its only used to hold podcasts. Nothing is further from the truth.
Take a look at for an excellent collection of old time radio shows and once you've had your fill there, take a look at http://www.archive.org/details/movies and the video archives.
For a quick taste click the play button below and listen to Strange Tales.
(If the player doesn't appear you may need to go to http://www.archive.org/details/oldtimeradio and listen to the radio show there)