How to find colossal Files on your hard drive?

WINDIRSTAT is a nifty tool that creates a graphical depiction of the contents of your hard drive .Its ideal for finding big files .Windirstat (availablew free at http://pcworld.in/downloads/index.jsp/dsecid=1494/dsubSecid=1503)scans your drive and produces a treemap showing each file as a colored rectangle proportional to the file size .
IN THE SCREEN capture at http://blogs.pcworld.com/tipsandtweaks/archives/windirstat.jpg, the big purple rectangle on the left filled with small rectangles is a slew of MP3 files .The green blob on the right signifies images .Click on a file name in the left panel to see where that file is on the color grid below.To jump to a file .select a large block on the color grid for it .Toolbar buttons let you zoom in a cluster ,copy a path ,open the file and more.