Microsoft has been tight lipped about the minimum and recommended specifications for their upcoming Windows Vista OS to this point, but the company has just spilled the beans. If you want to know what it's going to take just to run Vista, or to run Vista with the Aero interface in all its glory, see here...
To get an even better Windows Vista experience, including the Windows Aero user experience, ask for a Capable PC that is designated Premium Ready, or choose a PC that meets or exceeds the Premium Ready requirements described below. Features available in specific premium editions of Windows Vista, such as the ability to watch and record live TV, may require additional hardware.
A Windows Vista Premium Ready PC includes at least: