My audience consists of general interest and photography interest readers. I currently write for local newspapers and could approach them for a feature. The subject would be new. As a rule I do pitch story ideas and can self-assign, but it would have to relate to a place of interest. I could tweak my Photography Makeover article and use it as a reason to set a course for a day trip with photography in mind. I'd like to post the Wiki assignment to Wikipedia! It will be a good exercise in following guidelines and Wiki protocol!
I would send them links to the posts I'm interested in expanding as a start. Also I'd post to a few photography forums I already belong to for online publication.