Hey Bob,
You mean you leave the podcasts you’ve already listened to on the Clip until the next time you plug it into your computer? And then you delete them? I have 100s and 100s of podcasts on my (various) Clips – and I would have no way to remembering which I’ve listened to and which were still to be heard. I always delete each podcast at the end. I just bought a Clip Zip – which I am now thinking may have been a huge mistake!