In the ArcGIS Online gallery, on My Organization's Featured Content, I'd like to be able to display thematically-related items next to each other. For example, I'd like all my maps about the Los Angeles River to display together. The current sort options (most recent, most viewed, highest rated, title, and owner) don't allow this. I think you could have a Sort By Group choice that would display all items together that are shared to the same group. There are some complications (items shared to multiple groups, sort order within the group...) but I think arbitrary solutions to these issues would be okay.