Mysterious hard disk space vanishing? I'm running Snow Leopard on a Late 2009 unibody MacBook.

At the moment I was trying to do some late spring cleaning, and clearing up some HDD space. Now here's the weird part:

My User's folder shows that it occupies 179 GB of space. However when I go into the folder and add up the usage of all sub-folders and files within it, it comes to somewhere about 75GB. 

I'm just very curious as to where the other 104 GB resides. 

Any help would be appreciated! 
Thanks!
Might I suggest using one of the myriad apps available at your disposal to hunt down and find the rogue files that plague you? An excellent option that I found (and free to display the content, though not to delete from within the app) would be the DaisyDisk app. It'll show you exactly what's using up your space in a relatively intuitive/futuristic display.

From there, it's a little matter of simply deleting the files in question.