There are applications out there to display/search for man pages, including the hyperlinking. Look on versiontracker. I write one of them -- ManOpen -- so I'm a bit biased, but there's also Xmanview, GMan, and manThor.
NEXTSTEP had an application called Librarian that was a generic file indexer and searcher; you picked which directory trees were searched and these were typically all the documentation directories plus some others. It was a rather cool way to search for stuff. I think there's an MTLibrarian application out there that tries to do similar stuff, but I doubt it handles man pages in any special way. I haven't tried this app yet though. Look on Softrak at
Stepwise or versiontracker.