There is no memory leak per se. Of course certain releases might have problems with particular daemons but it is not a general problem. I cannot see your graph since you linked it to your gmail account, but if you are just observing the memory usage going up and up till all of it is taken and the system still swapping, that is unfortunately the default behavior. I will say that there is a problem with dual scanning in http proxy. If you only use sophos, the memory usage is way less than if you use avira or dual as your av scanning options. Most of us had been fighting with developers in karlsruhe since they didn't tweak the memory management of the kernel much. Now with sophos in charge, the problem has not gone away. You can add some of the memory optimization stuff yourself by using google since this is your home system. I usually add echo 1 > /proc/sys/vm/swappiness to all my installs. You will have to add the setting after each reboot or you can add it to one of the init scripts like /etc/init.d/beeps to make it stick. Generally, if you are using 4gb or more ram, you will not have many problems. Hope this helps.
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