Here are a few useful informational links for Digital Imaging, some tips on Photoshops or Illustrators:

1. Chuck Pink's Converting colour negatives with Photoshop.
2. Fulton's Scan information page.
3. Center for Innovative Computer Applications Tutorials and FAQ. How to convert an image file into another format. What is 'Gamma', How to scan a slide? How do I copy files between Unix, Mac and PC?
4. Tracy Mark's Photoshop bookmarks.
5. Digital Eye's