metacortechs.com

   I never actually contributed to the game in any way, but I did follow along by checking the websites and reading the posts at unfiction.com and various Matrix forums.  It was great in my opinion.

   One good Metacortex ARG fan site that I know of is www.metaurchins.org.  There's also http://metacortex.netninja.com.

   Edit: oh, you can also find mirrors of the Metacortex ARG sites at http://www.argn.com/graveyard.php.