1.Journeyman.TV - Currently has 11,336 Subscribers and 3,210 videos.
Nothing but incredible documentaries, although most are not embeddable, sometimes you are lucky and find some that are, here is one about the 2004 Tsunami, features incredible footage and fascinating interviews. You can find their non-youtube homepage here.
via videosift.com
2. The Real News - Currently has 6959 Subscribers [...] ...