Ready, Get Set, Boost! -- (ReadyBoost)

You can take advantage of today's thumb drives aka USB drives and the space available on them to get a performance boost from your computer.  After inserting the device and clicking on 'Computer', right click on the drive and select 'properties'.  Then click on the 'Ready Boost' tab.  There you'll find all the information you need to enable that feature.  Note:  This is for Windows 7 and Vista.  If you want to try it for XP the setup is different and the opinions on whether or not it works are mixed.