Any Dokuwiki fans? You can now take a look at this. This is a plugin I made that incorporates the Fotonotes™ client-side image notes library into Dokuwiki. I made the plugin because I am going to use it heavily on this site, especially in the projects section.
So take it, install it, tinker with it and don't hesitate to report bugs! It'll be even more gratifying to see people actually fix bugs in the plugin and contribute the fixes.