I am not sure if this is a problem with the kernel or due to the nature of the programs I am running.... From a fresh boot, memory usage averages around the 170 MB and as time passes it gradually increases to grab nearly all the available RAM (500MB)
This is a FAQ.
In short: it is not a bad thing. Linux sees free memory, and rather than wasting idle resources uses it as disk cache and for buffers. So while the memory is being used, it is not /in use/ as far as your interpretation of the above. It will be released to applications if/when you need it at a moment's notice.
Type the command "free" and read it carefully, especially the second line which shows the effect of subtracting the cache/buffers. I'm sure you'll find that you are actually using only what you thought.
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