this blog entry mainly serves as a nice overview for instructional chess videos and articles you can find on the net.
Squarology - Youtube Channel: by IM Daniel Tapia with some great eductional videos and really good live game commentaries (+excellent presentation and voice)
Kingscrusher - Youtube Channel: by CM Tryfon Gavriel, probably the biggest chess youtube channel; thousands of videos, playlists for specific players and much, much more
chessopenings.com - Youtube Channel: by NM Dereque Kelley, as the name suggests, focuses on different chess openings. very much recommended for beginners, a good headstart if you want to dive into a new opening
Chess Club and Scholastic Center St. Louis Videos: GM lectures on a wide range of topics.
MatoJelics Chess Videos: very calming voice and great presentation.
Chess.com Youtube Videos:
Chess.com Twitch Videos (the Chess.com TV archive)
thechesswebsite.com Youtube Videos:
Dan Heisman's Novice Nook Articles (now requires a chesscafe.com account!)
chessvideos.tv: instructional videos by non-titled and titled-players.
OnlineChessLessons.Net Youtube Videos: video previews and full instructional videos by titled-players.
aww-rats free video lesson program: the videos have no titles but you can find the topics at http://aww-rats.webs.com/my-videos.