A few nice free photo edit images I found:
Photoshop Express Quicktip 7 - Colour saturation
Image by floyduk
Part of a set of 10 Free Photoshop Express Quicktips video tutorials from PhotoWalkthrough. This episode shows how to tweak the colours in your image to make them more vibrant or more muted using the color saturation tool. You can test and sign up for Photoshop Express at www.photoshop.com/express.
New tips will be released every couple of days. HD versions are available at www.vimeo.com/photoshopexpress.
