What is a/the URL of the Stack Overflow podcast feed that works with Microsoft's Zune software/player?
OK, I felt bad mocking you for having a Zune, so I did a quick Google search and found in the comments of SO Podcast #5 that someone was having trouble subscribing with their Zune. However, it sounds like once the person upgraded to the latest version there was no problem. Do you have at least Zune 2.5? If not, you should try upgrading to see if that fixes your problem.
You can use this site to generate Zune-friendly one-click subscribe links:
Using that, here's the one-click Zune link (although I have no idea if the SO code will allow Zune-style links):
Update: nope, it sure doesn't. Not surprised. Well, you can build a local html page with an a href tag pointing to that Zune URL above and it should work.