MetaWeb

company spun out of Applied Minds, developed FreeBase, then acquired by Google Jul'2010 http://en.wikipedia.org/wiki/Metaweb

also Wikipedia-like site of explanations, seeded by Neal Stephenson's annotations to his Quick Silver.

• Dec'2006 - the Neal Stephenson stuff appears to be gone! Not moved, but totally gone!

  • http://www.metaweb.com/wiki/wiki.phtml?title=Main_Page

• Wayback Machine http://web.archive.org/web/20060725165412/http://www.metaweb.com/wiki/wiki.phtml?title=Main_Page

  • says they were registering quicksilverwiki.com and going to move the site over, but it seems like it never happened.

Note there's a similar site for David Foster Wallace's work.