ExoDus Challenge
I long (very long) hesitated about developing concepts for general search. Lets face it the static Web page paradigm that underlies the models of most engines has been more or less obsolete for years and the kind of search, it seems, demanded ("Give me something about") was more than questionable but I'm also no longer certain that these are the constraints but rather the "ist" state. People are increasingly, as they get more savvy of Internet sociology, less satisfied with the Volksempfänger offered by Google and Co. Exodus sets to re-cast the the whole "problem" as one of information discovery, search and retrieval of information dialogs rather than specific documents. Exodus does not set out to "re-draw" the borders of Internet page visibility but recast them as obsolete.
The imperative
The internet makes censorship really work since it can become transparent as air. No need to burn books when there are none. All you have to do is see to it that the books are invisible. While technically, unless it blocked explicitly (and in many parts of the world technology is coming into place to block content while in other countries just being caught with the intent to post content that has not "approved" one can and will land in prison or worse), technically something might be accessible BUT if one does not know where it is--- if its not visible--- it does not exist. This is Internet Metaphysics 2008 (and has been the case for some years now) and part of the Raison d'être of ExoDus: Changing the visibility.