However if you do browse this website and click show all shows and arrange by date this is the order http://channel9.msdn.com/Browse/AllContent.
As you can see, not all the posts are here in the feed. Its missing few important shows like technet radio or etc. I am not sure if this is intended functionality or not and/or there is criteria for having a post in the feed.
If this is intended functionality, I would like to know if there is any way I can get customize feeds as per my needs.