The GetRight Channels use the standard RSS/Podcast XML data files. There is a little bit extra added to the usual podcast file so GetRight can show the correct information window--several new XML tags. If you make a Podcast with the same tags, you can have GetRight or any other program that supports the tags prompt too.
Any podcast program that supports non-music files will work--they will just download the files without the extra information and confirmation prompts that GetRight will do. Or any program that supports RSS feeds would tell you if there were new items.
We're calling it an OknoCast.