Apple has revised and expanded its podcasting specifications in a message sent to iTunes podcasters. Apple says: “Since you’ve got an active podcast listed in iTunes, we would like to let you know about a few valuable new resources: First, the technical spec has been revised and expanded. Check here for all questions or problems related to your podcast, or if you’re interested in enhancing the appearance of your listing with iTunes-specific tags. There is also an Apple Discussions Forum exclusively for podcast producers.” [Thanks to MacMinute reader Mark Leaman for this news tip.]