It would be nice to have a tool to discover groups of orphan pages - t pages which link to one another but aren't linked from other pages in Wikipedia.
Such tool can be useful for finding orphan pages which doesn't appear in the regular orphan page reports. This could help improving the links in Wikipedia in a similar way orphan pages (and it is enougth to link to only one of the pages in the group to unorphan them).
Also such tool can be useful for discovering groups of interesting articles.