· Photoshop CS3 Books
There are many Photoshop books. Here are a few, mainly for photographers.
Adobe Photoshop CS3 for Photographers: A Professional Image Editor's Guide to the Creative Use of Photoshop for the Macintosh and PCPhotoshop Lab Color: The Canyon Conundrum and Other Adventures in the Most Powerful ColorspaceAdobe Photoshop CS3 Book for Digital Photographers (Voices That Matter)
Adobe Photoshop CS3 for Photographers: A Pr...
by Martin Evening
£17.96
I give this the highest recommendation and it's also the most popular. Might be too heavy for some though.
Photoshop Lab Color: The Canyon Conundrum a...
by Dan Margulis
£19.94
Adobe Photoshop CS3 Book for Digital Photog...
by Scott Kelby
£15.49
This is more 'quick tips' compared to the depth of the Martin Evening book.
Photoshop Restoration and Retouching (Voices That Matter)Photoshop CS3 Photographer's Handbook: An Easy WorkflowReal World Camera Raw with Adobe Photoshop CS3
Photoshop Restoration and Retouching (Voice...
by Katrin Eismann
£17.99
I have the previous edition of this one and rate it as one of the best on portrait retouching.
Photoshop CS3 Photographer's Handbook: An E...
by Brad Hinkel
£23.38
Real World Camera Raw with Adobe Photoshop ...
by Bruce Fraser
£15.99
Makes understanding and using raw files much easier.
Scott Kelby's 7-Point System for Adobe Photoshop CS3 (Voices)Photoshop Elements 6 (PC)Adobe Photoshop CS3 (PC)
Scott Kelby's 7-Point System for Adobe Phot...
by Scott Kelby
£14.99
More recipes from Kelby.
Photoshop Elements 6 (PC)

If the full version is too much, Photoshop Elements (PC) will suffice for many.
Adobe Photoshop CS3 (PC)

The full version of Photoshop CS3.