JimmyH: Interesting thread, and has pretty much put me off getting the HNP package. 3-4 hours to transfer an HD movie over wired ethernet is lunatic. Assuming it's a 2 hour film @ 6 GB an hour (which doesn't seem a bad assumption) it should comfortably take around 3-4 minutes over a gigabit connection. 3+ hours is inexcusable, and there is obviously something odd that Tivo does for file transfer?
I haven't used the home networking long enough to try a film, but on my home network with gig Ethernet, its fast watching a TV show between two tivo's and as you can watch/stream immediately as its transferring it works well.