Just so our friends in the Java world don't feel left out:

 

http://vcampus.osisoft.com/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.23.41/TestClientPIWS.zip

 

This is a CTP client of the IPIClientServices interface.  It is a little less involved than the WinForms sample.  It uses SWT + Axis, so some assembly of your environment may be required.