In Photoshop CS5, Refine Edge has been completely redesigned, letting you make selections in things like hair and fur incredibly easy. Adding a larger radius to the selections you’ve made will yield better results than in earlier versions of Photoshop. Also added is a touch-up brush, letting you add and remove portions of a selection more intelligently. Lastly, the Decontaminate Colors option allows you to remove color contamination where the removed portion of the image spills into the selection you have made.
These are just a few of the many changes that have been made in Photoshop CS5, one of the best upgrades I’ve seen on the software to date. Stop by Peachpit's Creative Suite 5 Resource Center or the Photoshop CS5 Learning center at http://www.photoshopuser.com/cs5.