Click the above image for a Full Size image and Calibration instructions.
Netscape Colorcubes and full color Images for reference
Adobe's Calibration Images from Premier but not of any Standard
Other misc images related to calibration but of questionable value
Off site links that are sure to whet your thirst.
Charles Poynton's FAQs on Gamma and Colour
Microsoft's Color spec - Hardware
Microsoft's Color spec - Software
International Color Consortium
Gamma Images for Brightness and Contrast adjustment