see above...
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6I faced the same question a couple years ago. The clear answer to which option, at the time, was Dundas Charts. And indeed, we did use Dundas Charts, with ease.
Since then, MS has acquired their chart codebase and included it in their 3.5 framework. You can easily use it with ASP.NET. Check out this blog post:
<asp:chart ...
Another third-party controls library I've used for charting is Devexpress. It took very little time to get a product up and rolling with Devexpress (maybe even less), but in the end, Dundas had more functionality for customization.
These options:
In addition, don't forget to check out the ASP.NET Chart control (linked to by Chris). I believe that MS bought out the control from Dundas.
I have used http://www.fusioncharts.com/ in the past and have found them to be very good.