Wish I'd seen this thread sooner so I could have chimed in sooner. My favorite tool for seeing the disk space consumption on a drive is this one:

Scanner
http://www.steffengerlach.de/freeware/

I just like the way it's laid out.

edit: And now I see Shonky already mentioned this one. So, this is a second recommendation for the one Shonky recommended. (Okay, third, after Dignan.)
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Tony Fabris