BTW, I disagree with Dargo. Trends and chart analysis become decreasingly useful the healthier a market becomes. Excessive following of trends is the main reason average humans trade worse than random.
There's a difference between "following trends" out of human nature/crowd logic, and "using trends as input into a well-defined strategy and following the output of the strategy". The former is a losing strategy in the long run, but the latter is the basis of many
successful asset trading methodologies (the Turtle system, for one example).