Anyhoo, I was rereading OotP last night and am in the chapter with the first Occlumency lessons with Snape... I noted that Snape made a point of sharing with Harry that "The Dark Lord, for instance, almost always knows when somebody is lying to him. Only those skilled at Occlumency are able to shut down those feelings and memories that contradict the lie, and so utter falsehoods in his presence without detection." (JK Rowling, p. 531, HP & tOotP, US Hardcover Edition)
This statement led me to think about Snape's own occlumency skills and whether he's fighting for the Order or Voldy's side... Depending on his own skills, which must have been pretty high - if DD was asking him to teach Harry this important and valuable skill, he must have been able to use this when *working undercover for the Order* as DD has claimed (I think in GOF), yet Snape was still convincing Voldy that he was on his side...
Perhaps this was a subtle hint from Rowling that Snape truly is a good guy and working to protect and do good for the Order!
If any of that rambling that I've just said about Snape, Occlumency, and my interpretation has made sense to anyone, please comment and share your thoughts...