I bought a "Ready NAS" Duo from netgear. I have an Apple TV running Boxee accessing that through my wireless network. My BV8 with BV4 controls that. The Readynas is mirrored 1 TB drive so I have a high level of fault protection.
I think you can connect other drives to the ATV as well ....... You could also use a Mac Mini, that should actually work a bit better since the ATV is a bit undersized for some applications, i.e. Netflix or Hulu streaming.
Cheers
JK
BS9000, BS2300, BC2, BL2500, BL3, Bl2, BS1, BV8, BC4, A8