Photoshop and Editing Digital Images
There are so many good resources for learning digital editing both on-line and in book form.
A great starting point is Clive Haynes excellent website.
Websites with Podcasts
The Digital Photography Connection
Photoshop User TV
Kelby TV/Killer Tips
Bob Faulkner's Photoshop Video Podcasts
Pro Photography Show
Kelby Training (Mainly Paid For)