I have been playing with the box since Friday. (purchased BB Dartmouth Crossing, NS).
Big plus I find for the WDTV Live Hub over the Live Plus in addition to being a media server/with1 TB storage is the remote. The first generation wdtv the remote is to small and fast forwarding was a pain to use. As mentioned in an early message, up to 16x fast froward and one can forward to a "time" in the video.
Using Cat5 no problem going from my PC to see the WDTVLiveHub, However. for the WDTVLiveHub to see my PC I had to change the WDTV default WORKGROUP from WORKGROUP to match my network Msxxxxx (case sensitive) and activate Network DDE and Network DDE DSDM from Administrative Tools, Services (using XP). Of course folders on my PC need to be shared.