Virtual memory leak

[Severin Crisp]

A few days ago I wrote in commenting on the chewing up of disk space as 
time went on.  Shay Telfer pointed me to "leaking" VM and he was 
correct.
I have identified the culprit as PhotoShop CS which generates a series 
of numbered swapfiles in private/var/vm/ and these are not subsequently 
released when you quit Photoshop but only when I do a reboot.  The 
swapfiles get successively bigger as I work - 64Mb, 128Mb, 256Mb, 512Mb 
.....!  When it totals something over 2Gb I take action.
What is the explanation/fix for this?
Severin Crisp