This neat – one of my favorite products, BeyondTV, records television (standard or HD) but it is only a Windows program. You can use BeyondTV Link to play video on any other PC on the local network (because of bandwidth constraints – if you want to view over the internet, use the BeyondTV Web Interface or Orb)
Your TV, both live and recorder, could also be done using Orb; however Orb lacks the nice interface BeyondTV Link has.
I’ve been contemplating moving to MaxOS X for my next Laptop purchase; this plus VMWare Fusion really makes it easy to switch over to a Mac for us Windows users.