are you talking the PVR's that sit under your telly, or thinking about getting a TV-card for your PC?
If the former:
1. If you buy a HDD/DVD combi recorder then yes, you can stream the VHS onto the player and either record straight to DVD, or record to HDD and then 'archive' it onto DVD.
2. If the PVR has a DVD player, then yes of course.
3. nope, 1 tuner = 1 thing to watch OR record at a time. but you can always watch the TV channels without using the PVR
4. see Q3
e! had a phone call and looks like all the questions have been answered, d'oh!