Finding large files

Hi,
Over the last couple of weeks I seem to have lost 30gigs of space on my home drive. I'm now down to 6G free and its starting to hang. (snow leopard with 300gig drive).
Is there a utility for visualizing which folders have largest files, or for finding big new files. I don't know where the space has gone and have looked into a few obvious folders, but haven't found anything obvious to delete or clean up...
Any ideas or utilities to recommend?
Eric

Try OmniDiskSweeper or WhatSize - VersionTracker or MacUpdate.

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