On this week's 512 Podcast (about ~6 minutes in) Myke Hurley and Stephen Hackett discussed going back and listening to old podcasts again, specifically Hypercritical, and how the 5by5 Time Machine makes that easy:
You can create a feed for any 5by5 show that will deliver the episodes weekly from today, as if they are new. [...] I'm not sure if it delivers them weekly, but I assume it does. It provides old episodes on a regular schedule.
Thanks Myke and Stephen for the mention!