Just wanted to make you aware of an excellent blog on ReadyBoost and Compatible Flash Drives. For those readers who do not know about ReadyBoost, it is a Vista utility that allows use of a flash drive as extra cache space as opposed to reading off the HDD.
This is not as efficient as adding extra RAM, but it does make significant difference in performance. The caveat as with all excitable things is that Vista is stringent and anal about the flash drives it will accept to use for readyboost. On inserting your flash drive, go to my comp, right click on the drive, go to properties and click on the ReadyBoost tab. Vista will test the flash USB and let you know if it passed or failed...if it passed you will be shown a dialogue asking you how much space on the drive to use as cache. If it fails Vista will inform you that the drive does not have the characteristics for Readyboost. :-(...
For more info on Readyboost and USB flashdrives, go here
..where I got this info from..an excellent guide.
I'll be writing a post on how I made my slow flash drive slip through the net and get vista to accept it as Readyboost enabled..