@Mason
I wold have thought that the A1 motherboard would be too big. However, the future boards Alan mentioned in his Gothenburg speech look promising, especially the mini-itx(?) boards. IIRC, they were looking at the boards having a horozontal AGP slot, to enable the height of the box to be kept quite low (like as in a pizza box).
I'm sure someone will find a way of fitting one of them into an old laptop one way or another.
-john