Let's just step past the rather inane definition of "Media RSS";
My definition of a mixed media RSS feed is this: it's a feed created for the delivery of video, photos, audio files and other media items all together by RSS.
and consider the implications;
Today, we're the only company that provides a way for you publish a channel of mixed media content (video, photos, audio and more) that's subscribable by RSS and can be displayed in an embeddable player.
There's some great possibilities that we're looking at here.