Great post by Clarence Fisher about reading a novel with another class via Skype and how he is using technology to build the conversation. Instead of being afraid of letting students chat online, he is developing their skills. Rather than hiding some of the less rigorous comments, he's sharing with everyone, so he can learn along with us.
The best part of this rubric isn't Clarence's rubric (although I think it's a great start) but the other rubrics that are shared in the comments, especially Delores Gende's stuff "http://bit.ly/bRZw7V"