These are variations on podcasting, named for the iPod. It's not that this new media idea can't be done on devices other than an iPod. It can. But I think people love playing with the "pod" and I have to say, I love hearing all the variants on pod.
In fact, I was thinking of getting iHodder.com or iHod.com. Just for the fun of it.
Bonus: Alison with The Temptation of Podcasting: NUTS! MUST RESIST! DAAAMN YOU PODCASTERS!!! Oh, but it gets worse...! Love it!