IT Conversations looks as if it has more than enough interesting stuff to keep my iPod topped up for a while!
And there are plenty of RSS feeds available. One thing that’s good is the option to download AAC files instead of MP3s. These provide better quality for a given file size, but the main advantage on iTunes/iPods, when playing long talks, interviews, audiobooks, is that the system stores a bookmark which remembers how much you’ve listened to. If you go and listen to something else and then come back, you carry on where you left off.