intertext

This is like the late lamented "Visual Thesaurus" (which not really late because it is still there, but no fun any more because you have to pay after you've followed about three links), only it's a kind of ... I'm not quite sure how you'd describe it! Called The Literature Map, you type in an author, and you get a kind of mind-map of other authors that other people read who like that author, which is cool enough, but if you click on your original author you also get info on her (or him) and links to discussions, and all kinds of things. Very, very cool. Try it!