I have more than 4GB too, i have about 8GB, 4x2GB. I find it does help if your developing stuff and your using Virtual PCs, i was currently running two or three Virtual Pcs which used 2GB of memory each, but thats in an extreme case, normally you wouldnt be doing that. But unless you got something which requires that much memory, 4GB will be enough for most people. For some reason though, my Vista x64 Ultimate seems to enter Windows using 1GB, then goes up to 1.5GB usage, not sure how i can reduce the memory usage.