From Microsoft Research – tryfsharp.org, a very cool site for testing and sharing F# code, complete with a built-in JavaScript charting engine. I just posted the Discount Curve sample to try it out.
Can’t figure out how to get the time axis to render dates, though - the DoJo chart needs the data to be numeric, and I don’t see a way to use a label function to do the conversion back to date, although the library itself seems to support it…