In my opinion, the new Open as Tabs feature in Photoshop CS4 is a much easier way to work with multiple images at one time. Instead of each image cascading down the monitor when opened, Photoshop CS4 defaults to opening them all in a single tabbed window. Simply click on a tab, to view the image. Use the new shortcut Cmd (Mac) / Ctrl Win) + ~ (tilda) to cycle through the images (this was changed to align Photoshop with the other Creative Suite applications) or use the traditional shortcut Cmd + Tab (adding the Shift key will reverse direction).
