I agree with Engadget:
[T]rying to get a trademark on the term â€œiPodcastâ€? is kind of a slap in the face to all the folks who were doing this long before you came along (and in turn, all the folks who were publishing audio shows on the web before the term â€œpodcastingâ€? came along).
I don’t get warm fuzzies about Apple anymore. The iPod Nano is tiny yeah but another annual: Smaller! Lighter! You’ll But It! really isn’t all that innovative.