Hello
Sometime I do not have the time to listen to all my downloaded podcasts. I have at least 30 subscriptions. It should have been possible to delete all downloaded episodes/mark all as done in order to start fresh and wait for new episodes. I Itunes you can do that. It should also be possible for one subscription (mark all downloaded podcasts as done)
The ability to delete all downloaded episodes/mark all as done is on Eric's to do list - http://mantis.snoggdoggler.com/view.php?id=1579 - allow bulk operations on episodes
To add to that, it would be nice to select a podcast and choose "mark all podcasts NEWER than this as unplayed".