Seeking Alpha has been working on ways to add more value for their users, which has resulted in them launching an "app store." Fortunately, there are several free apps, including a pretty interesting charting application from ChartFacts.com. ChartFacts allows users to easily retrieve, customize, and overlay a variety of data streams. (Note: I think you will have to have Microsoft Silverlight installed to see these embedded charts, but not to create your own charts - you can save them as images too)
So if you wanted to quickly pull up a chart of 30 year mortgage rates, you can do that:
If you were more interested in the weather in Concord, NH, you can do that too:
Notice that I clicked on "min" "max" and "mean" - you have the choice of including whichever data you want.
I was even able to graph Wade Boggs's performance over his career, again choosing the categories I wanted:
I found ChartFacts well worth the time to play with, enabling users to quickly and easily obtain well formatted charts to use in whatever illustration they are trying to make.