On Illustrator CS4

CNET:

There are also a variety of subtle enhancements to program operation, including the ability to apply graphic styles additively. A few changes to the panels include a modification of the Appearance panel’s operation–it’s now an attribute editor, allowing you to toggle visibility or adjust parameters like opacity, blend mode, and fill color–and the addition of a basic Separations preview panel for pre-preflighting color. Adobe improved (some might say “fixed”) Isolation mode, where you drill down into objects to selectively edit, to keep from tossing you out if you deleted the only object in the isolation set. Live preview on clipping masks makes working with them a bit easier, and the Smart Guides now have little readouts that display basics like object dimensions.

“Pre-preflighting color” gets me all worked up.