LJ has added a new feature, called FRNK Radio. It's essentially a constant audio webcast, made up of the most recent public voiceposts made to LJ. (Presumably a random selection of them.) Kind of interesting, although I'm not sure it's something I would choose to listen to. Regardless, though, be aware that, if you make public voiceposts, they may wind up in this stream at some point.
(I don't see any obvious way to count yourself out from this feature, although I suspect that there will be some demand for an option to do so...)