are you saying vista doesnt use more memory if its available ?
The discussion seems to be surrounding whether anyone "needs" 4Gb of ram -- so if Vista uses more memory, then that's just another argument for "needing" 4Gb of ram.
In other words, to echo what BRiT just got done explaining, we need relevant information versus a snippet from a an 18-month old beta of an operating system that has since gone through qualification, gold stamping, and a whole service pack.
Further, we need to see these tests with modern video and audio drivers; they too consume memory and were FAR from "right" when this test was started.