In Snow Leopard (10.6) there will be the ability to use GPUs for general work too. I am wandering how the 9400 video card will work with that (will be good enough for doing the job?)
I doubt the video cards will work together. Its probably going to be the same 'using one at a time' system we have now. But it should make a difference with everything, not just the new Macbooks but the older ones too.