Readyboost technology for Windows XP
Despite all this, there are some new features that are worthwhile in Vista, such as Readyboost. Windows Readyboost helps make the operating system and applications start faster by using flash memory for cache.
Now, Vista refugees on Windows XP can enjoy this same functionality, thanks to Eboostr. With this third party application, one can set up caches on up to four devices, and it's compatible with all Readyboost compliant devices!
A free trial can be downloaded that works for four hours after each boot, or you can get the full version for just $29.