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Just a comment, when you check the amount of free memory you will notice that most of your RAM is being taken up, Linux seems reserve a large percntage of memory while its running, a good way to see how well your system is running is by how much swap you're using. Also you can add an applet to your panel that shows your current memory usage and also processor, network, etc.
right click panel > add to panel > utility > system monitor
then right click the system monitor to chose options.
to expound on the free command a bit, the following is a sample. the following shows that the machine has a total of 384M of RAM of which 177M is available (shown on the line that says "+/- buffers/cache" in column "free" (177388). that amount is what's free after adding back what's been used for cache (which is given back on demand). i have swap turned off which is why that line shows all zeros.
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