I still don't know why 3dfx dumped the add-on idea like the Voodoo 2. I know a lot of people who have purchased cheap PCs with video cards built on to the motherboard and have to disable them to install a 2d-3d card solution. I can't see why they haven't made some kind of add on card that works with a Notebook either. I'm not sure how the power would work, but I think it's a great idea if they could get it to work. If they can't beat nVidia, why not get into something that people would buy and make it affordable.
Games are critical development in the evolution of man machine iterfaces.
Imagine interacting in any world you please for intertainment, for learning or even exploring your own imagination. That will take lots of video power. I'd be happy with a deskside Onyx system. In about 6 months the latest and greatest from nVidia should depreciate quite nicely for the average-joe's wallet. I don't think folks'll be too happy piping two video cards together, limited by the not only the monitor, but the weakest link of the cards.