I just moved a few media files from Libsyn to a different server and updated the links accordingly. If you've bookmarked any of the old Libsyn links, they won't keep working for long.
If you have trouble finding any Interplanetary-related video or audio, email me at firstname.lastname@example.org, and I'll help you track it down.
By the way, Libsyn is a really good media hosting service. I'm just not using it enough to justify paying for it (even though their plans start at a very reasonable five dollars per month).