The main stumbling block is that Vista doesn't support DMB-TH. Otherwise, you could just buy a USB stick like the AVer one and have it work automatically within Media Center. The worst thing is that the boxes and promos for the USB sticks make it look like it supports Vista, which it does but only through the manufacturer's programs.
I haven't had any problems with streaming through wireless.
Anyway, going to try GB-PVR and report back.