有用的jfreechart文档

http://blog.csdn.net/buglu/archive/2006/07/21/953890.aspx
http://blog.tom.com/monkeylikebanana/article/458.html
http://blog.sina.com.cn/s/blog_5377fe0f010004eb.html
http://www.blogjava.net/amigoxie/archive/2007/09/30/149765.html
http://ltc603.javaeye.com/blog/30207