CS4 Kuler

New for CS4 is Kuler - an online gallery of colour palettes.  It lets you build your own favourite sets of colours and offers tools based on the science of colour theory to create harmonious colour combinations.
Even better, you can see thousands of palettes created by other designers, showcasing everything from cool and subtle schemes to loud and vibrant colour mixes.

Access PalettePicker from within Photoshop SC4 via Window...Extensions...Kuler. Although this extension is free, you will receive an activation code with your free order which must be used when you first use PalettePicker.

To learn how to use Adobe CS4 extensions, see here.

Introduction to Kuler

Using Kuler Colour themes in CS4 programs