RickD: I heard from someone a while ago that Zinwell were releasing an official pvr firmware + USB HDD combo in Australia, and if you google long enough you can find an image of a Zinwell USB drive that looks like it sits under and matches the DVB-T box.
I have a NAS that has LAN+USB, it would be awesome to be able to record onto that using the Zinwell via USB and then watch the recordings using XBMC or another media player attached to the network.
I think you'll find this is the Zinwell 630. I mentioned earlier about rumors of a HDD addon for the 620, I've been told by two different sources that there will not be a HDD solution for this but that we may see this newer 630 unit replace the 620 and that a solution may launch with this.
If this does happen it of course will feature DRM and you will not be able to take your recordings and play them on a PC.