Hello everyone ... I am currently keeping myself busy with K2 too and just as all the other here (in several threads of the forum) I am looking for multi-category publishing of a single item! However, during my research for a solution I came across a thread in people.joomla.org ... check it out:
people.joomla.org/groups/viewdiscussion/112-Multiple+Categor...
Apparently this guy, named Jason Hart, did some work on an own MultiCat-solution for K2 already. Sure, it is only an Aplha-Version and only in combination with K2 v.2.2 but it might be a good start for a complete solution to our all problem ... don't you think so too? I am unfortunately not a professional progammer myself but maybe you guys or the people of the K2-development team can give this guy Jason Hart a hand in what he already has started ...
Here is his website with the current Alpha-Version of K2 MultiCat as download:
www.developmii.com/downloads/k2-multicat.html 
