TheTechLounge posted a review on the ATI Radeon HD 2900 XT 512MB Video Card

It has been six months and one week since NVIDIA launched their highly acclaimed 8-series of DirectX 10 video cards. ATI is more than a little late, but then again, why rush? Yes, many people have been rewarded for jumping on NVIDIA's graphics, but with Vista's slow adoption and a complete void where DirectX 10 games should be, there's been little to gain besides frame rates... NVIDIA has gained a lot of ground over the past six months, and has successfully hard-launched a whole set of mid-range cards and two flagships--ground broken by ATI. ATI and Microsoft jointly developed Xenos, unified shaders and all, so if ATI doesn't show up NVIDIA it will be fairly shaming.

ATI Radeon HD 2900 XT 512MB Video Card Review