The page http://haskell.cs.yale.edu/ghc/docs/5.04.2/html/network/index.html links to the "CGI" library, but following that link produces the following error:
Forbidden
You don't have permission to access /ghc/docs/5.04.2/html/network/Network.CGI.html on this server.
Looking at the download-able archive of the documentation, it appears that the page is simply missing.
The page is there, but I assume because it contains the string ".CGI" the server is mistakenly refusing to serve it. I'll see if the webmaster knows why.
On a similar notion: The "parent" link in the generated documentation almost never works. Say, you are on the documentation for Control.Arrow and follow the "parent" link, then the link will point to "PATH/Control.html" -- which does not exist; the correct name would be "PATH/index.html". I _guess_ that this can be fixed by providing appropriate flags to Haddock, but I am not sure.
Yes, this should be fixed. The idea is to take you to the parent *module*, which for many nodes in the tree doesn't exist (eg. Foreign.C has a parent, but Control.Monad doesn't). The parent button should just be removed if there isn't a parent module. Cheers, Simon