IMO PCI-Express is the best thing out right now. The X800XT PCI-E is about the same as an X800XT AGP card because there aren't any cards out yet that use the enhanced features of PCI-Express. ATI is currently working on Video Cards that use "HyperMemory".
"HyperMemory uses the high-speed bi-directional data transfer capabilities of PCI Express to store and access graphics data in system memory, leading to less of a dependence on graphics memory and ultimately a lower overall system cost."
"HyperMemory uses the high-speed bi-directional data transfer capabilities of PCI Express to store and access graphics data in system memory, leading to less of a dependence on graphics memory and ultimately a lower overall system cost."