(shameless plug)
A tool for doing functional and load testing on WCF and Web services. http://www.wcfstorm.com/wcf/home.aspx
Screenshot:
cool! not free though...but for a company that's seriously into WCF development, I'd say this is a must
http://devpinoy.org/blogs/cruizer
The free one that I have is STORM which is for web services.