Mythnettv is a rss and atom aggregator for video downloads. use this program to subscribe to video rss feeds, and it will download these videos for you.

mythnettv is meant to be used in conjunction with mythtv and will place videos that it downloads into your storage directories and make them selectable with the rest of your recordings in the mythtv frontend. although it is meant to be used with mythtv, it can also be used as a standalone application.