file/folder biggest size program

I have a windows server 2003 that has a 150gig drive.  However it only has like 20 gigs free.  The bad problem is that it has a bunch of folders and what not.  So I was wondering if anyone knew of a free app to show me the biggest folders and files?
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DIRUSE from the 2003 Support Tools works well for this purpose.

For instance, the following command will display all directories over 300 MB in size:
diruse /S /M /Q:300 /D C:\
casitAuthor Commented:
thanks for the links.
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