I'm almost there! I used the Yahoo pipes solution, and that URL works great in Google Reader. If I select Subscribe To Podcast... in iTunes, and enter the exact same URL, I get an error."I've actually been using Yahoo Pipes thanks to a tip in these forums that I found in a Google search. Took me some time to set up, but since then I've had little-to-no problem. Since the tubes themselves have your credentials built in, iTunes never needs them."
Big thanks to the people who explained the lower-case username workaround.
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