The Photoshop Elements 6 Book for Digital Photographers - Scott Kelby, Matt Kloskowski
This book is the BOMB! If you need to know how to use Adobe Photoshop Elements, this is the book for you. I learned more from this book than any other! I've moved on to Photoshop CS4, but I still use the techniques and ideas from this book today.

Unfortunatly, I can't remember who I loaned it to and I don't have it anymore. But the lessons are in my brain!

Highest recommendation.