I tried to find a link or a icon of a feed on YouTube, but I found nothing. I don’t check YouTube as frequently as before, so I need to add a feed to Google Reader. YouTube provides feeds but limited and quite inconvenient. You must compose a feed link on your own and only user feeds and tags feed are available. No subscriptions feed.
YouTube’s About RSS explains what feeds it provides and how to get the link of feed. Since I only need the user feed, therefore I quickly explain how to get this kind of feed link. The URI format is: feed://www.youtube.com/rss/user/[insert username here]/videos.rss. Just replace the username, then you get the link of feed.
If you have several favorite users in you subscriptions, then you have to add the feeds one by one.
How about Google Video? Just forget it.
Updated on 8/29: YouTube Data API has released but still useless to me.