Finally got the comment section to work, at least partially.
Found an interesting site today, gnod, or global network of dreams. If i understand it correctly, it uses reader feedback to situate authors in proximity to each other conceptually, and then maps the proximities visually. As it is dependent upon reader's casual listings of favorite authors, and assumes that reader tastes imply closeness of ideas, it can result in some very odd juxtapositions such as Rabelais and Philip Johnson.
Still, the visual representation affords some interesting links and encourages some adventurous exploratory reading. I highly recommend spending a few minutes with gnod.