This was posted to my PAS support group this morning, and it was extremely detailed and accurate. Its in three parts, and long, but very VERY good. http://www.youtube.com/watch?v=PQIXAjC_v50.
Note: Parental Alienation can happen from extended family, grandparents, aunts, uncles, and so on, its not just the immediate parent. Good for everyone to watch, also, if you’re going through this, its a great learning tool.