Silverlight Pie Chart
Create simple or exploded pie charts, with a customizable threshold for inclusion in an "Others" category, and text labels and images that can be displayed within or outside of the pie in a manner that avoids overlapping. Users can click or drill down to view underlying data, explode out a section of the pie, and get information via tooltips.
The “Others” category in the Pie Chart control can be used to group the smaller data values into one slice.
Pie Chart Labels
Customize the Label Extent and Label Position.
Visualizing OLAP Data
Bind OLAP Data to the pie chart and allow users to drill down in sequence.