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Hi everyone,

While I agree with you that there are some free charting as well as some historical data which can be downloaded sparingly, I would suggest that to do real trend analysis, modeling and systems development for algorithmic trading strategies, along with associative research and back testing.  You need a complete local database of historical data to use with your charting and analysis package of choice.  To see the dramatic difference involved between looking up symbol data online and havinga complete database try the free trial offered by these guys...
http://www.forextickdata.com

They have end of day data and intraday high frequency historical data, across multiple asset classes.  Best of all the data includes delisted issues making it survivorship free.

They support a very nice integration script for Amibroker Pro.

Happy research.

David