There's a reason us geeks still like PCs over other media devices: Having hackable general purpose networked devices make rapid innovation possible. Witness the buzzword right now, Podcasting. What this is is simply applying RSS to MP3s, offlining audio in the way text got offlined. RSS 2 is smart enough at this that there's an emerging standard for how this is done, i.e. automated, early entries in this new software category is iPodder. So iPod is audio TiVO on an open network.
I'm not that big on radio in the first place, so I'm not really the target market for this kind of thing, but obviously I'll need to have a look. Please remember though the truth of the audio blogging manifest.