I am sure that most visitors to this site will have an interest in digital photography, either professionally or as a keen amateur, so here are a few sites which are full of useful information and downloads.

http://www.normankoren.com/
http://www.efg2.com/Lab/index.html
http://www.shortcourses.com/software/


These sites certainly helped me to a better understanding of the exceedingly complex and fascinating world of colour photography and printing. They are well worth visiting and have links to dozens of other useful sites.