I was searching my phone for 5 minutes looking for 600 megs of missing storage.
I found 500 megs under /var/root/Library/MobileFinder/Trash
it appears to be all of the files I deleted from my Downloads folder that I downloaded using the file download plugin.
Then I found 100 megs under /var/root/Library/Caches
Just the cache files from all of the applications you use
Can someone manufacture an application that views the files in these folders using a GUI with the option for deleting or restoring.