Well I read this on MS long back (can't track any link or page now

) but Windows Vista can use USB 2.0 Pen Drive as RAM or as the swap partition to speed up the computer .... Don't know if it could be effective at all .... ???
Don't know if it actually does bcz I read it long before Vista Release it was kinda "will be there" feature ....
Abt XP naah I don't think so else our "SPEED UP UR XP" articles must've covered them by now