Here is an interesting project I have currently been.   It's a big program, and the project is divided in several phases and as different projects.  The management team would like to see a quality report and we'd like to report all open and close defectds for all projects in one chart.

Please see the attached screenshot to understand the result I created. It uses the 'project' inditifier on the stack-bar-chart.

However, The trick here is, since there is no project last from the very beginning till now, it is not feasible to show the x-axis from e.g Jan/09 to Feb/10.  What I did to solve this problem is to go to the first project and created a fack defect with the 'Date Opened' value equals to Feb 01 2010. In the chart parameters, specify the default project as the first project.  And then you got a chart reporting the whole life cycle!