How to Change the hue and saturation in Photoshop

Nick from Greyscale Gorilla gives a great tutorial on not only how to adjust the hue and saturation of various objects in Photoshop, but he also demonstrates how to select and isolate these objects for better chromatic keying.

Check out his blog entry here:

http://greyscalegorilla.com/blog/2009/07/15/changing-colors-using-hue-and-saturation-in-photoshop/