WPF and charts are a perfect match. WPF can render amazing graphics, so it is likely that many component developers are working on WPF charting tools.
I found a WPF prototype (SwordfishCharts) on Code Project that is fun to play with.
Interesting Features
- Tracking Cursor – point on chart follow the mouse
- Zoom -right mouse button zooms in on data
- Pan – left mouse button pans the chart
-Walt

This is my small contribution to the statistical diagrams in wpf:
http://febrer.wordpress.com/2008/05/26/graficos-estadisticos-con-wpf/