QUOTE(2Bdecided @ May 16 2008, 05:19)

mypodder, and autopodder, are heavily tied into podcastready.com, and don't see the existing podcasts on my machine. mypodder supposedly lets you change the folder where the podcasts are being stored, but ignored whatever settings I entered. autopodder "helpfully" renamed the podcast filenames so they no longer sort by date!
myPodder go to podcastready.com if you what to look at some new podcasts... it should go somewhere by default... why not to go "home"? You can add any (arbitrary source) channel from "Options"->"Subscribe to a podcast channel". No problems with folders; moreover, myPodder runs from my DAP itself.
Did you tried "Options"->"Import" to get your old podcasts? (I had no chance to do this by myself)
I'm not sure if any such software allows you to "switch" one to another on the fly. The program should track what was downloaded and when; it's better to play with fresh install to avoid the mess with old downloads.