As stated on the main page (at the time of this writing), FinnegansWiki was begun in February of 2005. February 9, to be precise. At 02:37 EST, to be even more precise.
The author (this author, not James Joyce) does not make any claims to scholarship regarding either Joyce or Finnegans Wake in particular. The author is, quite simply, good at webbing things, and very interested in the subject matter at hand.
Consider this a FREE world-wide online study group. The book lends itself to the wiki format, and the wiki format lends itself to collaboration, so it "just makes sense."