Microsoft's been feeling a bit awkward about their corporate bloggers using the term "podcast", and have tried to push "blogcast" as an alternative term (last item). Hasn't really caught on; and for that matter, it's no more accurate, since you don't need a blog to 'cast.

Even though not everyone has an iPod, they're called podcasts for roughly the same reason some people stick refer to "Xeroxing" something.

I went to the store to get a six-pack of orange Coke and a box of store-brand Kleenex.