Excel Charts

http://www.clearlyandsimply.com/

This is Robert Mundigl blog with a focus on dashboards tools, clarifying  techniques and providing  templates.If you are interested in intelligent data analysis,  simulation, optimization, visualization and project management, this site is a must to visit and enjoy.

http://www.andypope.info/

Excellent  resource providing   alternative  and imaginative solutions to  Excel problems, especially Charts .