"Ready Boost" to increase the speed of VISTA

If your system is not acting as fast as you would like, get some additional memory with ReadyBoost.

ReadyBoost takes advantage of the fact that flash memory offers lower seek times than the hard disk. The flash drive will be used as a storing location for virtual memory pages of 4KB each. Hard drives are faster at reading large amounts of date, whilst a flash drive is faster with smaller amount of data, like the one cached by Windows.
How to get additional memory with ReadyBoost

Connect your USB flash drive. In the AutoPlay window that pops up, select Speed up my system. Your flash drive will be tested to determine if it meets the requirements. This is because not all of them are as fast as Vista needs them. If it passes the test, the Properties dialog box will be displayed. Specify that you want to Use this device and then choose the amount of space to be reserved for ReadyBoost. Windows will recommend you to use a certain amount of space, but it is up to you if you want to stick to that amount. The amount you will reserve for ReadyBoost cannot be used for storage.

You should keep in mind that using ReadyBoost will not actually add RAM memory to your computer, it will only be used as a memory cache.