CS3/CS2 Tools window!
Adobe Creative Suite 3 brought a change to the Tools window in Photoshop. It is now a longer single column window instead of the traditional two columns tool palette. It is possible to go back to the old design however. It is useful if not all your Macs are running CS3 and you want consistency across the board. To change the look of the Tools window, click on the double triangle in the upper left corner. You'll be able to switch back and forth between both that way.