I've rebuilt the wiki from scratch, as it was comprehensively trashed by spambots.
Once I've recreated the main and some other pages, and it seems reasonably well-defended against vandalism, I'll open it up to public user registration. I won't do this until I can be reasonably sure of being able to support the wiki properly, i.e. prevent/deal with vandalism and keep everything running as it should.
Apologies to anyone who created content on the site - it really is a jungle out there!