Following on from my previous post about image resolution. I came across this Adobe TV tutorial by Peachpit TV for Photographers, which complements that post.
The tutorial covers the basics of scanning images for retouching and then goes on to show some basic retouch techniques. One useful tip relates to the use of the History Brush, not something I have ever used but I may after watching this.
Not sure who the the young lady is who gives the tutorial be she is easy to listen to for a change.