We seem to be having a problem with IPR #154 in iTunes.  It hasn’t shown up yet even though we’ve dutifully uploaded the file several times.  Libsyn, our trusted podcast hosting service, believes it’s a problem with Feedburner, a service through which we pass our feed to give us better stats.  We are working on it.  In the meantime, IPR #154 is of course available for download and playing right here on the blog.  Thanks for your patience.