Indicator Tutorials at Worden.com

The Worden.com forums have a lot of good information about what an indicator is measuring. They're presented in short (5-7 min) Flash videos that also show some features in the TeleChart platform. Although I don't use TeleChart (but plan to try it soon), the tutorials on the indicators were still very informative. The ones I found most helpful are:

• Understanding moving averages, part 1
  
• Understanding moving averages, part 2
• Undestanding MACD -- this is the clearest explanation I've seen on how MACD and histogram are calculated.
  
• Understanding Stochastics
  

There are many other short videos on those forums on a variety of topics, mostly related to how to use TeleChart. They're careful not to give advice on how to trade or interpret charts, saying it's beyond what they're allowed to do, but most videos give examples that hint at the possibilities, enough for you to know what to research next.