I detest Flash sites, I refuse to view them.
If the web designer can't be bothered to make a proper web site then I can't be bothered to look at it, simple as that. Why should I have to take a security risk for their sake?
I also dislike tree menus.
CH is fine as it is, or it wouldn't be so successful.
We are arguably the number one free computer help site in existence, judging from search engine results.