I don't understand Channel 9 feeds

I’ve been watching Channel 9, but recently I’ve found it quite hard to navigate. It used to be so that their RSS feed contained Microsoft-generated content — videos and things. Which was great. But since a while ago, their RSS is full of the random user forum threads about random stuff. I’m not interested in that as much as what Microsoft itself has to show and say.

So it turns out they now have many feeds — one for forums/user-generated content (this is also the one you find on the frontpage) and one for each type of “media” — videos, photos, screencasts, podcasts. The media appears to be “Microsoft content” that I’m looking for. Couldn’t find out whether there is an aggregated MS media feed which would be most optimal for me — for now, subscribed to all the media ones. If I were making the site, I would make it a bit more clear on the frontpage, and alert users through the feed itself if the feed policy/content changes. (Or maybe they did but I missed it.)