BTW -
I am now using 5 NMT's and each have 1TB drives in them. I also have one server running both Tversity and Playon TV. This combo is working just fine for me. The video library (which kind of floats) is at about 1200 DiVx and HD movies. I can stream just fine in HD. I still though utilize Tivo's in the home for recordings and streaming recording videos. If I want to save anything from the Tivos I have the choice of that and occassionally I still do this. The streaming of the Playon variety works just fine for me.
I do see issues ahead though in that many ISPs are starting to cap their monthly data flow. At this point its not an issue; but say if you are a netflix addict it may become an issue. I think there will be a trend towards "a la carte" TV sometime in the future. I personally consider the data coming to the house just another utility wire (like gas, electric, telephone, etc).