DirCaster is a PHP script that allows one to very easily start Podcasting MP3 files from their web host. This allows original content creators to easily provide a feed for the Juice Podcast Receiver, jPodder, and other "podcatching" software. The feed is also fully iTunes compliant.
Simply drop the dircaster.php script (and accompanying files) into a directory on the web server and it will generate a valid RSS feed suitable for Juice Podcast Receiver, etc., based off the MP3 files (with appropriate ID3 tag information) in that directory. To broadcast a new MP3 file, simply upload it to the same directory that contains the DirCaster script and files.