This came out last week but warrants mention. Apparently in the halls of Redmond it is forbidden to speak the word "podcast." It is, in fact, a "blogcast" and this "pod" thing is just clouding the issue. I mean the iPod and iTunes are not the only media combo out there. They're just the best selling, best designed, and most intuitive media combo out there and Microsoft products can also be used to play back audio files and even, on occasion, allow you to purchase music from services such as "Rhapsodyster" and "MomomediaJukebox.net." So it's a blogcast. Windows will un-register itself if you attempt to use podcast again.
UPDATE - This is probably an urban legend, but who cares.