Anyone with a Windows Home Server in their house, I just discovered with SageTV, there is a WHS add on. Free 2 week trial as well.
To simplify matters, SageTV also offers these units:
http://sagetv.com/hd_theater.html
Seems like a very nicely priced extender to go with the SageTV software.
As far as I can tell, you only need to connect your HD box to the WHS via firewire.
Could be a simply solution for those that already have the hardware. I have not had the chance to test this out myself but certainly intend to.