So, finally. Here's the final 120GB, dual tuner GB-PVR box in all it's glory. In this photo the DVD drive is ejected.
The uber-quiet fan on the left is controlled by a knob under the DVD drive that allows my to turn all the fans down to make the system nearly silent. When the movie is over, crank the fans back up and the system stays cool even though it runs 24/7.
It is awfully big and slightly menacing, but the door in front locks up to keep the kids out. (Although my youngest does have a habit of hiding the keys around the house in very unsuspecting places.)
If your interested in the full story, dig through the old DIY PVR posts and see how this Tivo-ish thing got built.