|1. CTRL + Click on any given layer to Select it.
2. You just about finished your layout design and you realize it requires a new Object and so your layers require rearrangement. Here's what to do, in your Layers Palette 'Link' all the Layers that need to be rearranged and with the 'Move Tool (M)' shift all the Layers in one movement. Or with the 'Arrow' keys on your keyboard, nudge those Layers in the desired direction.
3. Make use of 'Layer Sets'. The folder icon on the bottom of the Layers Palette will create that just for you. Then place the necessary Layers inside that Folder Set for proper organization. Its a good idea to start a design with use of these.
4. Ok, so you never bothered to use Layered Sets and your close to finishing your design, but the 'Layers Palette' is an unorganized mess! Here's the solution. Decide what layers are appropriate for a Set. For example you have five Layer elements that make up a logo, then link them together. Then click on the little black 'Arrow Menu' on the top/right of the 'Layers Palette', and from the Drop Down list choose 'New Set From Linked...'. Give the Set a Name (Logo for example). Finally, notice that the Blending Mode for that new layer set is 'Pass Through', change that to 'Normal'.
5. For more workspace area, or if your Document exceeds the workspace area because of all the Palettes blocking your view. Hit the Tab key to toggle all Palettes visibility mode.
6. Save yourself a click on the 'Zoom Tool' on the Toolbar Palette by using the 'Ctrl + Plus(+)/Minus(-) keys. Works well if your like me and you have all the Palettes toggled off (Tab Key).
7. Spacebar is your friend.
Ever have a good zoom in a document or you design above the normal 800x600 resolution, and say your using the 'Polygonal Lasso' tool and you reach the end of your viewable area in your document, well, instead of reaching to adjust the scrollbars, press the 'Spacebar' key and the tool you are using automatically toggles to the 'Hand' Tool so you can adjust your documents position . Let go of the 'Spacebar' key and your back to the previously used tool.
8. You have more than one Document open and you need to see them side by side for comparison, go to 'Window/Documents/Tile.
9. If your personal about how your Workspace looks, then save it.
Go to 'Window/Workspace/Save Workspace', then give it a name when prompted. Handy if there are multiple users sharing your computer, or if certain Workspace's work better for different design sizes.
At anytime, Reset the Palettes or delete the current Workspace by going to 'Window/Workspace/Delete Workspace' or 'Windows/Workspace/Reset Palette Locations'.
10. Got a lot of documents open and need to see a quick Slide Show.
Press the F key to toggle 'Full Screen Mode', then press the Ctrl + Tab keys to cycle through the open documents.
Ctrl + Tab will cycle Next through your documents in the order they appear in Photoshop.
Ctrl + Shift + Tab will cycle Previous through your documents in the order they appear in Photoshop.
11. Cycle through all your fonts.
Have a text layer selected in your document, then go to the 'Font List' drop down and select the default one or the one you have originally chosen, then use the Up/Down Arrow keys to cycle through the list of fonts read by Photoshop.
Font's that have no alternative 'Bold/Italic' options, use the 'Faux Bold or Faux Italic' ooptions from the 'Window/Character' Panel.
When using a lot of text on a single layer, use the 'Ctrl +A' keyboard feature for easy selection.