USB key speeds up Windows Vista

This is just unreal. According to this article, with Windows Vista, I could double my Tablet PC's system memory from 2GB to 4GB, just by adding a 2GB USB flash drive.

The technology is called Superfetch. Hard drives are the slowest possible storage medium in your computer (followed by the on-drive memory cache), while System RAM is next fastest, then the CPU's L3, L2, and L1 caches, in that order. A USB key would basically be in-between the hard drive and System RAM, so while you're not really going to double your memory, applications and data could be cached intelligently from the hard drive onto a memory device plugged into a USB port, and used like system memory.

Want another example? Most people know what a page file is by now ... when you run out of memory, your computer pulls stuff out of RAM and stores it in temporary space on the hard drive. Essentially, Vista can use the far faster USB memory keys instead. "The user can still remove the memory key at any moment without affecting system stability." I'm assuming this means that it's actually storing that data twice, once on the slower but reliable hard drive, and again on the much faster USB device.

Vista is going to change a LOT about computers ...