One-shots and shorts would probably be better, since more people would be able to find time to listen to a single session, rather than an entire long-running campaign. If you pick something longer, maybe select a specific episode that you think can stand alone, and which (preferably) doesn't contain too many spoilers for people who haven't listened to the whole series. Maybe one of the first episodes in a campaign, or a shopping episode.
Remember to advertise the fact that the AP Club is up and running again. Twitter, Facebook, etc. (I know you don't have an account, but either Hal, Thing, or even Pencil-Monkey could do it... Hang on, that's me!)
Are you planning on just picking an episode and then letting people comment, or will you be kicking off the discussion yourself? If you have the time for it, you could record videos of yourself commenting and reviewing the audio you've picked (heck, people do it all the time with video games, movies and suchlike - why not try it with AP podcasts?).
Maybe get some guests to join the discussion, either people who've listened to it, or - if possible - the GM or one of the players from the game. @Balgin
did a nice interview with the author of Tomb of Haggemoth
, you could invite him (the author, that is) to listen to some of your Patron exlusive Haggemoth sessions, courtesy of the YGGernauts, and then debate it. @Daniel
and several others would probably cream their pants (those of them who actually wear such garments, that is) at the opportunity to chat at length about their campaigns.
If you make note in advance of certain quotes or times in the episodes that are particularly interesting, you could play them back during the discussion.
Or, you know, just stick with old-fashioned written commentary. Whatever you have the time for.