http://www.win.tue.nl/sequoiaview/
this cool program displays all your files as squares, the bigger the square the larger the file. Really handy for spring cleaning the ol hard drive, since you can colour code .max and .psd (or any other extention) and locate those directories full of massive sequential-saved files.
I just freed up about 10 gigs in about 10 mins, all stuff I never realised was there
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I've been using Disk Size Manager for a while now. It's similar to this, but it uses a pie graph.