My PC has 3.1 G of RAM and I am running Vista Home Premium. In Task Manager I noticed that  2.2 G are cached and which MEANS .8 G are in use. Only 48 KB are free.(No apps are open)

The speed of my system seems fine but can someone give me a sense as to whether or not I can improve on the .8 G that are being USED to maintain basic services. (ie McAfee, Spybot TeaTimer, MS SideNote, Dell Support Center etc, etc).

Should I bother trying to improve this???Where are these #'s from ? ?It's normal, and expected behavior in Vista.
Read more here: http://www.codinghorror.com/blog/archives/000688.html
Quote

And the most important rule of cache design is that empty cache memory is wasted cache memory. Empty cache isn't doing you any good. It's expensive, high-speed memory sucking down power for zero benefit. The primary mission in the life of every cache is to populate itself as quickly as possible with the data that's most likely to be NEEDED-- and to consistently deliver a high "hit rate" of needed data retrieved from the cache. Otherwise you're going STRAIGHT to the hard drive, mister, and if you have to ask how much going to the hard drive will cost you in performance, you can't afford it.