Hi Robby,
I have used in the past about 3 different open source charting components, most recently ZedGraph.
Now I tend to be involved in projects using PI WebParts so you get much better PI functionality.
Rhys.
OSIsoft PI System SpecialistsPI consultancy on PI Systems, PISDK, AFSDK, OLEDB etc and PI custom developments. Well pretty much anything to do with PI!