1. Search feeds
http://gdata.youtube.com/feeds/api/videos?orderby=updated&vq=mapreduce
(replace mapreduce with your query)
2. Search in a category
http://gdata.youtube.com/feeds/api/videos/-/Film/?vq=michel%20gondry&orderby=updated
(Film is the category, while michel gondry is the query - you need to replace the space with %20. Other categories: Music, Comedy, News, Sports, Autos, Howto.)
3. The latest videos from a channel
http://gdata.youtube.com/feeds/api/users/radiohead/uploads?orderby=updated
(replace radiohead with your channel)
...or only the videos that match your keywords:
http://gdata.youtube.com/feeds/api/users/radiohead/uploads?orderby=updated&vq=jigsaw
4. Feeds for favorite videos
http://gdata.youtube.com/feeds/api/users/garyferro/favorites?orderby=updated
(replace garyferro with your favorite username)
5. Your subscriptions
This is not a feed that comes directly from YouTube, it's a Yahoo Pipe.
http://pipes.yahoo.com/pipes/pipe.run?YouTubeUsername=google&
_id=28303b479f11e24199be4cafced31ad9&_render=rss&itemLimit=20
(concatenate the two lines and replace google with your username)
The feed above shows the latest videos from the first 25 subscriptions. For those who have more subscriptions, I created a new version of the pipe that shows the videos from up to 500 subscriptions:
http://pipes.yahoo.com/pipes/pipe.run?YouTubeUsername=MotherTalking&
_id=58e4f59f9e5e3282aaffdcbaf05ba68d&_render=rss&itemLimit=50
(concatenate the two lines and replace MotherTalking with your username)
6. Playlists
http://gdata.youtube.com/feeds/api/playlists/50653251EDB4E764
(the code in italic can be obtained from the playlists's URL (e.g.: Eric Speaks)
