Photoshop and ImageReady have so many tools Adobe decided to stack similar tools in the toolbar. Normally, to choose a hidden tool, you click and hold a tool in the toolbox for a second or two until a list of stacked tools appears. Then, you select the tool you want.
As we've mentioned before, those seconds you wait quickly add up to a lot of wasted time. The next time you want to use a hidden tool, press Alt in Windows or Option on the Macintosh and click the tool in the toolbox. Each click will cycle to the next hidden tool. Pressing Shift while you Alt-click or Option-click will cycle to the previous hidden tool.