Free space on boot drive constantly decreases until reboot

Hi there. I have a really weird thing happening that I've never seen before.
I'm running 10.7.4 on an iMac, and have about 45GB free on the system drive. At least that's right after I boot up the system. After that, the free space available on my HD slowly but constantly decreases, and the computer slowly but surely becomes less responsive. When the free space on the boot drive gets down around 37GB (which takes 2-3 days... I usually never turn the machine off) I get so many spinning beach balls... in ALL applications... that the computer becomes basically unuseable and I am forced to reboot. But as soon as I do, free space is back up to 45GB, and computer is snappy and fast again.
What the heck?

Your problem is excessive swapping of data between physical memory and virtual memory.
That can happen for two reasons:
(1) You have a long-running process with a memory leak (i.e., a bug), or
(2) You don't have enough memory installed for your usage pattern.
Tracking down a memory leak can be difficult, and it may come down to a process of elimination. In Activity Monitor, select All Processes from the menu in the toolbar, if not already selected. Click the heading of the Real Mem column in the process table once or twice to sort the table with the highest value at the top. If one process (not including "kernel_task") is using much more memory than all the others, that could be an indication of a leak. A better indication would be a process that continually grabs more and more memory over time without ever releasing it.
This suggestion is only for users familiar with the shell. For a more precise, but potentially misleading, test, run the following command:
sudo leaks -nocontext -nostacks process | grep total
where process is the name of a process you suspect of leaking memory. Almost every process will leak some memory; the question is how much, and especially how much the leak increases with time. I can’t be more specific. See the leaks(1) man page and the Apple developer documentation for details:
Memory Usage Performance Guidelines: About the Virtual Memory System
If you don't have an obvious memory leak, your options are to install more memory (if possible) or to run fewer programs simultaneously.

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