For several years, photographer and designer Trevor Morris has maintained a great set of Photoshop keyboard shortcut cheatsheets. We’ve linked to his collection several times for previous versions of Photoshop. If you’ve upgraded to Photoshop CS4, download this handy PDF cheatsheet, print it out, and keep it near your computer:

Photoshop CS4 Shortcuts (Mac)

Photoshop CS4 Shortcuts (PC)

If you haven’t upgraded to Photoshop CS4 yet, we’ve got you covered. Trevor keeps an archive of his previous cheatsheets all the way back to Photoshop 5. We’ve got links to his full archive past the jump.

This week’s tip was pulled from a collection of rapid-fire speed tips for working with guides in Jason Hoppe’s Moving Faster in InDesign CS3/CS4 webinar. Ever want to quickly delete all the guides on an InDesign page? Here’s how:

You can quickly select all the guides on your page by typing Command-Option-G (On the PC, that’s Ctrl-Alt-G). Then hit the Delete key to delete them.

A new feature in InDesign CS4 makes it even easier, Right-Click or Control-Click on the ruler or a guide and choose Delete all Guides in the pop-up menu.

Tip: If some guides have been locked in position, select all guides first and then choose Object > Unlock Position or type Command-Option-L to unlock them. This technique does not delete guides from Master Pages.

Recently, I needed a photo of my friend Steve Laskevitch’s new book to illustrate a tip. The problem, his book doesn’t ship until the end of February.

That’s where a remarkable set of scripts from Photoshop trainer Mark Monciardini saves the day. Mark has designed Cover Action Pro, a collection of specialized Photoshop Actions that magically turn your flat artwork into book covers, software boxes, dvd cases, magazines, and other images perfectly suited for e-commerce sites. The full collection of Photoshop Actions costs $127.

Read on to download two free Photoshop Actions from this collection.

As someone who writes lots of tips about the Mac, I spend plenty of time working with screen captures. A new $15 screen capture utility named Layers is going to save people like me a lot of time each week.

What does it do? Simple. Layers captures your screen as a layered Photoshop PSD file. All windows, menubars, and (in some cases) icons are isolated on individual layers. Even better, it creates layer groups like “Main Menu”, “Dock”, or “Desktop” to group related elements together.

Layers — Capture your screen as a layered Photoshop document.

In the image above, I took a single screen capture of my Mac using Layers. Then I created a quick animation showing how different elements can be turned on and off, showing what is below or above them.