Readyboost has nothing to do with system memory, and if you are low on system memory (which everyone with 1G or less will be with vista) it will do nothing to help that.
All it basically does is add another layer of disk cache. You have 2 layers of disk cache already, normal system ram windows allocates and hardware on the hard drive.
All it basically does is add another layer of disk cache. You have 2 layers of disk cache already, normal system ram windows allocates and hardware on the hard drive.