I could be totally wrong (or this could have totally changed at some point), but I'd heard a rumor a while back that all of the archives were stored as .mp3s somewhere on the WFMU site (which they use initially for the streaming .mp3s that are available the week of the show). Somewhere hidden from your view and mine. Which, if true, would seem to make it feasible and easy for WFMU to make .mp3 archives available to the general public, except for the music rights issues outlined above. So I'd love to see it, but it probably won't happen.