Working in cyberspace I find this very interesting and slightly disturbing.
I have a lot of copyright images on the internet and have ALWAYS protected, what I consider, valuable.
The changes in the law will not affect any of my previous work as it will remain my copyright. However, try enforcing your copyright on images in cyberspace! It is full of frustration and extortionate costs. Unless your material is being used to generate SIGNIFICANT income for someone without your permission then its just not worth the hassle BELIEVE ME!
In the US they have a great law... Cease and Disist... Simple, straight forward and easily applied to anyone using copyright material without permission. I don't believe that this law is applicable in the UK unfortunately.