To set the view to the top left hand corner of your image press the Home Key. Press the End Key to set the view to the bottom right hand corner of your image. To move the view one full screen down press the Page Down Key.
Press CTRL+Page Down (Mac: Command +Page Down) to move the screen view one full screen to the right. Press CTRL+Page Up (Mac: Command +Page Up) to move the screen view one full screen to the left.
Selecting Just the Pixels in A Layer
One very easy way to select an object that is on a transparent layer is to press the Control Key (Mac: Command key) and click on the layer that contains the object in the Layers Palette. Doing this ensures that only the visible pixels will be highlighted.
Tile Images for Better Visibility
When you simultaneously open a bunch of files in Photoshop they automatically cascade, and it can be difficult to select individual windows within all the overlapping files. To eliminate this problem choose Window> Arrange> Tile and all of your open files will rearrange themselves to be visible all at once. When you're ready to close the windows you don't have to spend time closing them individually, instead use the Close All shortcut Control+Option+W (Mac: Command+Alt+W).
Getting Rid Of the Welcome Screen – And Bringing It Back
When you first open Photoshop CS you will probably see a Welcome Screen that has links to Tutorials, Tips and Tricks, and a set of Color Management Help Files. At some point you might want to stop this screen from coming up. You should see a check box at the bottom of the screen that you can click to hide the screen at startup.
Later on, if you change your mind and decide that you want to have it show up again, you can temporarily bring the screen back by clicking under the Help menu and choosing Welcome Screen.
Cycle through All of Your Open Documents
At some point you may want to find one of your open documents that are hidden, but navigating using the Window menu won't help because you can't recall the name of the file. Instead you can press Control-Tab repeatedly (MAC and PC) to cycle through all of your open documents and switch between them.