Oxford University Press:
Podcast is a portmanteau word (= two words that are combined to make a new word) that was invented in 2004. It combines the words iPod™, a well-known music player and broadcast.
http://www.ipodder.org/history:
The name, which derives from Apple’s popular mp3 product, the iPod®, was designed to be streamed or downloaded to the user’s machine and then transferred to the user’s mp3 device.
Kann ja sein, dass es dir nicht gefällt, aber der iPod™ hat Podcasting populär gemacht. Warum die Rumheulerei?