A computer based on Nvidia Ion will cost $ 299

The Nvidia Ion platform has been certified to work with the Windows Vista operating system. The first Ion-based computers will appear this summer. Their cost will be 299 dollars. This was reported in the press release Nvidia.
Computers based on the Nvidia Ion platform will allow you to work with high-definition video with a resolution of 1080p, including movies from Blu-ray discs. Also, they can run games that require support for DirectX 10.

In addition, Nvidia Ion supports all the features of Windows Vista Home Premium, including Aero Glass and Flip3D. Built-in graphics processor platform allows you to quickly edit photos and videos.

The Nvidia Ion platform, designed for ultra-cheap mobile and desktop computers, was introduced in December 2008. Its main feature is the integrated video system GeForce 9400M. It is installed in the latest generation of Apple laptops and is several times superior in performance to Intel integrated graphics.
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In addition, Ion contains DVI and HDMI connectors and supports DDR3 standard memory. But the platform does not consist entirely of Nvidia components. In particular, it requires an Intel Atom processor. © Lenta.ru

I also strongly recommend to read the review on the THG website.