I keep getting message "Your MacOs X start-up disk has no additional room for application memory"

I continue receiving the following message on both my iMac and MacBookPro:  "Your Mac OS X startup disk has no more space available for application memory. To avoid problems with your computer, quit any applications you are not using." I started getting these messages, on both computers, during the same week.
I have over 500 GB free space on my iMac HD and 4 GB RAM. On my MBP, I have 472 GB  free on my hard disk and 8 MB RAM. BOth are running Mac OS X 10.6.8.
Any ideas what is going wrong here?

By way of further explanation, your computers each sometimes require the use of Virtual Memory whenever the RAM is fully in use.  The Virtual Memory is actually unused space on your harddrive where the computer temporarily store data since the RAM is full.  To be effective, your harddrive, or more correctly, the partition that OSX is installed on should have at least 15% Free Space to be used as Virtual Memory.
If you have multiple partitions on your harddrive, it is possible that the partition that OSX is on is too small in storage capacity and so you lack adequate Free Space on that partition to be used as Virtual Memory. Thus you get the Warning Message.

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