I am setting up a podcast web site and my media are all .m4a "enhanced podcast" files that work with iTunes. I can't seem to get the enclosure to automatically be created. It works for an .mp3, but not the .m4a. Is there something I am missing on the server to make it work properly? Otherwise, is there a way to hack it to make WordPress use getid3() to pull the information about the files? It seems to work okay for the WP-iCatter plugin if I manually add the enclosure.