I'm intrigued by your comment that "it can be important to view thematic cross sections rather than vertical stacks of data." Could you elaborate on what you mean by "thematic cross sections"? Do you have an idea of what this would look like so that you could help the rest of us visualize what these thematic search results would be? Is there another website out there--either academic or non-academic--that provides these thematic search results? Citing that could provide an interesting point of reference.