Another early #faircamp 2.0 teaser: I'm currently redesigning/rewriting the Podcast/RSS/Atom feed system and I'm now pretty confident that 2.0 will bring "everything is subscribe-able" functionality (opt-in of course).
I.e. you can then let people subscribe to a release (which could be e.g. an album, or a podcast), to an artist (probably a "flattened" feed where each item is a track, i.e. all tracks by the artist across all albums, singles, podcasts, ...), or to the whole site itself (which in 2.0 might also be a podcast or an album or an artist in itself - more on that at a later point :)).