I've just had a look at the tutorial on CS4's new improved toning (Dodge, Burn and Sponge) tools. They look to be a quantum leap better than the old ones with a 'protect tones' function. This essentially means you can dodge and burn skin, for example, and preserve its tonality at the same time so you're not just making it whiter or blacker. I dodge and burn quite a lot but always have to be very subtle and cautious, this should enable you to be much bolder. It looks like it will be a seriously USABLE new feature and not just a gimick.