In my post on April 16, 2008 I've wrote about "the trend is your friend" and how one would
draw trend lines to help identify the trend.
http://mytradersed.blogspot.com/search?q=trend+is+your+friend
But there are other ways to determine the trend.
In this 10 min video, Dr. Barry Burns, of TopDogTrading.com, explains how using a simple moving average can help
give you an idea of what the prevailing trend is. Enjoy!