MadManMoon, here are some links you might be interested in:

http://www.gifteddevelopment.com/About_GDC/whytest.htm

http://www.hoagiesgifted.org (the hoagies site has an enormous wealth of information, including a state by state list of private testers http://www.hoagiesgifted.org/psychologists.htm , although they are by no means the only ones)

smile