A somewhat brief article as unfortunately I have not left myself enough time to write a proper commentary on the subject: Microstock contributors are probably already aware of the thread at microstock group [3] and 'movement' organized by boycottfotolia.org [4]
The issue stems from photographer sentiment that devaluing of their work by Fotolias launch of 'dollar photo club' is something of a 'last straw' considering the license terms, image resolution etc provided. I can't really say I blame them considering Fotolias track record on transparency (or lack thereof).
Fotolia have now provided an opt-out from syndication [5] of your Fotolia port on dollar photo club, 'DPC'. The option can be found by editing your profile on Fotolia and selecting the "contributor parameters" tab, there is a modify link next to "Sell my files on DPC".
I think that today (May 1st) should be a day for sending a signal of a mass opt-out rather than deleting portfolio or images. I know that opinion may undermine the pledge that some contributors made on the boycottfotolia site but I feel a middle ground has been reached (ideally it would be an opt-in). Overall it's up to each contributor to read all the information and make their own decisions where and where-not to sell.