Interesting engineering project for their engineers, but I don't really see this being a viable product. Mainly due to the timing of the thing.
If r600 is all its cracked up to be, and it is due out in a month or so, assuming this thing launches around the same time, why would anybody want one? I could possibly see such solutions being useful on non-crossfire boards as an upgrade path, but I simply don't see potential buyers for this product.
Lack of DX10 support, and AMD/ATI support also hurt it.
Maybe they are already working on a dual r600 solution as well which depending on price & config could be cool.
Just my opinion, and I am just a lonely pessimistic bastard.