The website is down, and no cached versions seem to exist...
The main page isn't cached, but at least one of the subpages is: http://webcache.googleusercontent.com/search?q=cache:DzlZ_Bs... (maybe they had no-cache on the front page and forgot(?) on the symbols page)
That's too bad, because I would have wanted to see this one: http://www.cavelanguage.org/language-specification (one need not click, it's the same "application error" page)