On the ATI side of things, the Radeon X700 XT is nowhere to be found for sale, but the Radeon X700 Pro seems to be readily available. The folks at GeCube have even worked up a passively cooled X700 Pro with a heat-pipe cooler.
I'm not sure what to make of the Radeon X700 XT availability situation. I've heard rumors that the XT will never be a high-volume product, kind of like the X800 XT PE appears to be. If true, Radeon X700 Pro could be left to fend for itself against the GeForce 6600 GT at the $200-ish price point. I've asked ATI about this, but so far, they've only told us to expect XT cards "soon."