Peachpit Press and O'Reilly Media are two of CreativePro.com's favorite publishers of software-related information. They're busy churning out new titles to keep up with Adobe's recent release of Creative Suite 4. Here are two fresh off the presses for you Photoshop users:

Adobe Photoshop CS4: Up to Speed
This 192-page book by Ben Willmore (now on Amazon.com for only $16.49) is a great reference when you need to know only what's new and what's different in the upgrade.

As Peachpit puts it, "rather than sift through hundreds of pages detailing every last Photoshop feature and function (both old and new), you can go directly to the new features that interest you the most and get the explanations you desire in the classic Ben Willmore style--intuitive, crystal clear, and in-depth."

Adobe Photoshop CS4 One-on-One
Deke McClelland's 544-page volume, published by O'Reilly Media, is designed to cover the application (and Bridge and Camera Raw) from top to bottom. It's now on sale at Amazon.com for $31.49)

Deke supplements the 12 step-by-step tutorials in the book with five hours of video demonstrations.