I know it's not easy but here we go : take a chart of the Dow. Where the price significantly "bounces"or "retraces", bam.... you have a support/resistance. Now, the more it touches that level, the more people are watching it. Light or Heavy ? draw your own conclusions. Is that what you are looking for ?
http://www.cbot.com/cbot/pub/cont_detail/0,3206,1058+15784,00.html Try this it's exactly what you need.