Hard drive oddness

It's currently telling me I have 33 gigs available on my 148 gig hard drive. That being said, I can't 115 gigs worth of stuff. I checked the finder and I have about 50 gigs worth of apps, personal (docs, music, movies, etc.). I checked to make there wasn't multiple accounts and there isn't. I keep my backup on a seperate hard drive.

Can anyone explain where the 65 additional gigs are coming from?

download and run "disk inventory X"

http://www.versiontracker.com/dyn/moreinfo/macosx/22694