This may be something that can be discussed as part of the session proposed by Jean Bauer, especially if Omeka is one of the platforms that people are interested in using to visualize data. Or a stand-alone session for people who are already using Omeka with the Neatline plugin with a  focus on how to best provide access through metadata and geo-location information that will be useful to scholars, students, librarians, other audiences who will be viewing, searching, and using the content created/visualized/posted in Omeka.