>> Convert Layer Styles into their own Layers: Sometimes you will want to have more control over layer styles. The good news is that you can. Take this example of a New Zealand map which has an outer glow and a stroke applied as layer styles. If you select a layer that has layer styles applied to it, you can navigate to Layer > Layer Style > Create Layers which will create separate layers for each of your layer styles. As you can see below, the map has been separated into its original later, the stroke layer and the outer glow. You can now edit these layers on their own just like any other. >> Batch Action Processing: Actions are a great way of automating a repetitive task but what if you need to apply the same action to many files? Sure, you can do them one by one but of course this is time consuming if you have to apply it to many files. Luckily Photoshop can do this for you. Go to File > Automate > Batch… in Photoshop which will bring up the following dialog box. The best thing to do is to place all the images you want into a folder and then choose that folder as the source. You can then choose a destination and filename formatting. Remember you can even use this as a simple operations such as saving a batch of files of one format into another. >> Cutting Out Images with the Help of Calculations: Here is a quick tip for cutting out objects from images. If there is a decent amount of contrast between the object and the surrounding area or background then we can use a Photoshop feature called calculations to cut the object out very quickly. View the channels panel to see the red, green and blue channels. Calculations in Photoshop is a way of combining two different channels into one so now we need to work out which two together will give us the most black (plane) against white (the sky). We will then turn the end result into an alpha channel to create a selection. To begin using calculations go to Image > Calculations… At this point a new channel will have been created. This is the alpha channel but it’s not perfect. We need to create the maximum contrast of black against white to create the perfect selection. We do this by changing the values of black and white using levels (keyboard shortcut: ctrl or cmd + L). The key is to remove as much grey as possible without destroying the outline of the object in the image. Also, use the brush tool in white to brush out the ground layer. Once you’re happy, hold CTRL (CMD on Mac) and click on the alpha channel to make the selection. Head back into the layers panel and invert the selection (CTRL/CMD + Shift + I). Now apply this as a layer mask and you will only see the plane remaining. >> Layer Comps: Layer comps allow you to create different versions of the same layout in one Photoshop file, making it easier to manage multiple variations of page designs.When creating a new layer comp, you can save the visibility, positions and layer styles of all layers. This means that layer comps will only remember theses values. Make sure that they’re all always ticked or you will come across problems with multiple layer comps. The final tip that makes this even more useful is the ability to save out each layer comp to its own file. Go to File > Scripts > Layer Comps to Files. >> Typography Keyboard Shortcuts: Let’s face it, dealing with text in Photoshop is not exactly a pleasant experience. Luckily there are some keyboard shortcuts to ease the pain a little. * Double click the T icon in the layers panel to select all text in that layer. * Commit text changes by pressing CTRL/CMD + Enter. * With text selected, hide the selection colour with CTRL/CMD + H to see an accurate preview of * the text. Great when working with colour. * CTRL/CMD + Shift + Left or Right arrow key selects the whole next or previous word. * CTRL/CMD + Shift + > to increase font-size by 2 points. * CTRL/CMD + Shift + < to decrease font-size by 2 points. * CTRL/CMD + Shift + ALT/Option + > to increase font-size by 10 points. * CTRL/CMD + Shift + ALT/Option + < to decrease font-size by 10 points. * CTRL/CMD + ALT/Option + Left or Right arrow keys to increase or decrease kerning between letter by 100. * ALT/Option + Left or Right arrow keys to increase or decrease kerning between letter by 20. * CTRL/CMD + ALT/Option + Up or Down arrow keys to move the baseline up or down by 10. * ALT/Option + Up or Down arrow keys to move the baseline up or down by 2. * CTRL/CMD + Shift + L, R or C keys to align the paragraph of text left, right or centre. >> Smart Filters: Introduced in Photoshop CS3, smart filters give you great control when dealing with filters. All you have to do is select your desired layer and then Filter > Convert for Smart Filter. Start applying filters and you will see that they appear below the layer name in the layers panel. Now you can reorder them and double click to edit. The best thing is this is a non-destructive way of applying filters as you can delete them and return to the layer’s original state. Source
You guys can find all of the CS4 short cuts here http://www.shortcutworld.com/en/win/Photoshop_CS4.html
Interesting. Didn't know a lot of the shortcuts but ill have a look at the shortcut link you provided.