"Of course, the setup of having both Nvidia and ATI GPUs in one system are exceptionally rare"
yeah, I think this is exactly the point. what a massive coincidence that nvidia does this just after the ATI 5870 launches and takes the performance crown from them? there are alot of people using nvidia gpus, specially the awesome 8800gt like me that will be looking for an upgrade, and nvidia is trying to give us a reason for holding off buying this new shiny ATI card dumped in front of us, and wait for their new cards. it would almost be commendable if it wasn't for their Dick Dastardly way of doing it!
All they have actually managed to do is piss everyone off, and not actually succeed from blocking ATI users from nvidia physx. and it would so obviously be hacked too. I mean it may have worked if your market was mainstream n00bs, but its not, its hardcore users like us who will have no trouble using this hack.
silly nvidia.