May I suggest a video course? That is the fashion nowadays you know. And Lynda.com makes the best ones IMO. And the best teacher at Lynda is Deke McClelland..(notice that I didn't mentioned IMO this time :)

Lynda.com Photoshop CS3 One on One The Essentials
Lynda.com Photoshop.CS3.One-on-One.Beyond.the.Basics
Lynda.com.Photoshop.CS3.Extended.for.3D

These ones are the ones you need. Just find out who you will have to murder or sleep with..!