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If you haven't seen the new google finance pages ( http:\\finance.google.com ) it is worth taking a look. At first glance it looks like a rip-off of finance.yahoo.com, but when you look a little closer, the charts are actually rather interesting. First, they are draggable like google maps, but more importantly they are annotated with key news stories and announcements. Take this example of the chart for Intel:

Those marks with letters in them like "E", "F" and "G" are links to news stories. Click on them and you go to the headline, from there it is another click to the story itself. There is an old saying which goes "buy on the rumor, sell on the news". At least this chart of Intel seems to illustrate the wisdom of that. It would be interesting to see if there is any more corroborating evidence - and now you have a way to find out.