Maybe you should have a look at : "The Photoshop Elements 6 Book For Digital Photographers" by Scott Kelby and Matt Kloskowski
I'm told it should be pretty good (yes should be since it's not released yet, but you can pre-order it from Kelby Training).
Scott Kelby is one of the leading Photoshop tutors and Matt Kloskowski is a leading Lightroom tutor so I guess the book will be pretty good (I pre-ordered a new book on Photoshop and Layer by Matt Kloskoswki myself a few days ago so I hope it's a good book
).
You can probably find a lot more PSE books on Amazon and other stores.