Just read on Autosport that Torro Rosso want to keep using the V10 until the start of the 2008 season. I don't see what they are achieving by this apart from bad publicity. Unless Mateschitz in under the impression that there is no such thing as bad publicity I don't know. Red Bull will have definetely recieved more column inches across the world by doing this but apart from that it seems a bit silly to me.
Imagine that Torro Rosso discovered an amazing aerodynamic advantage in the wind tunnel that gave them a second a lap around any circuit over their rivals. The other teams will simply protest no matter what the reasoning for any advantage is put forward. They will claim it is all down to the V10.