10GB of disk space mysteriously used overnight.

Hi all,
I left my MacBook on today when I went out, and it reported 27.99GB of space free, and I came home to find I have 17.34GB of space remaining. I've not installed anything or done more than open Safari and iTunes. Given I'd just been on a data purge to free up some space, I'm not terribly happy about losing 10GBs of space. Anyone know what might have happened to use up disk space so quickly?
Dave
Update: Using JDiskReport, I can see that 9.8GB of files were modified yesterday, yet they don't turn up in Spotlight searches.
Message was edited by: DaveBinM

Hi,
Download the free Grand Perspective and see whether it can help narrow down the location of the excess files.
S.

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