If you download an RSS reader and subscribe to one of these conference feeds, you will receive the latest audio files when they become available. This is probably more convenient than continually checking the website. Your RSS reader will probably download all the files for a conference when they are released.
As we are new to this kind of publishing, we'd appreciate your feedback.
Instructions for Itunes:
In Apple Itunes, from the pull-down menus: Advanced, Subscribe to podcast... then enter the URL.