“Uh oh. There’s something wrong here: why does the video podcast not have video?”
That may be a question you’ve asked if you’ve tried to watch a video podcast on your iPod touch (or perhaps other iPods). I asked it the first couple of times I tried to watch a video podcast. But it turned out that while I was trying to view a video podcast, I should have been viewing a video podcast: it’s all a matter of which menu you choose — you need Videos > Podcasts, not Music > Podcasts.
That may look obvious, when you see it here, but Podcasts is the main category for both audio and video that I subscribe to in iTunes. Call up Music > Podcasts on the iPod touch and the iTunes Podcasts listing is replicated, containing both audio and video podcasts. Try to watch a video from here though, and all you see is the static cover art.
That’s pretty misleading, and an easy mistake to make.