The description on the website sounds very enticing:
"eBoostr is an alternative solution to Vista’s ReadyBoost and SuperFetch technologies now available on Windows XP. It speeds up your PC and improves application responsiveness by using flash memory and free RAM as an extra layer of performance-boosting cache for your PC."
I downloaded the product and tried it on my XP based IBM T42 laptop with 1GB of memory. For a flash drive I used a Lexar Lightning with 2GB allocated to the cache. The Lightning is one of the faster flash drives and is well suited to the role.
The setup was simple enough, although creating the cache took a few minutes. Once it’s setup the program runs quietly in the background, actively caching commonly used files and memory processes. It’s quite active: the LED on the Flash Drive was flickering just about every time I did something on the PC.
The product uses an unusual trial system. The program works full-featured for four hours after a reboot, then disables itself until the next time you boot, at which time you get another four hours.