PCI-Express video cards have been available for a little while now, but the high-end cards are not widely available yet. ATi's Radeon X800 and X800 XT cards are starting to show up on e-tailers' virtual shelves, but the newest NVIDIA card you'll find in retail form is a GeForce 6600 GT. Demand for PCI-Express cards probably hasn't been really high yet, though. However, now that nForce4 is about to hit the streets, I'm sure we'll see a spike in demand.