A new book by Teo Lachev has just been released by Manning Publications (http://www.manning.com/lachev). Titled, "Microsoft Reporting Services in Action", the book described the Microsoft .NET Reporting Services. Chapter 6 is available for free preview at http://www.manning-source.com/books/lachev/lachev_chp6.pdf and makes extensive use of OpenForecast.
Even if you're not using Visual J# and Microsoft .NET, you may still find the chapter on OpenForecast and reporting to be very helpful in your development.
Now, you might think why is a Java library featured in a book on Microsoft .NET. The cool thing is the way Teo was able to import the OpenForecast source code into Visual J#, then package it as a .NET component. Don't contact me for details on this - just see how he did it in the preview chapter.
Thanks to Teo's help earlier in 2004, I made some minor changes to the OpenForecast source code enabling easier migration to Visual J# for those that may need to do this.