Here's something I found using these tools. I had the app "Root Uninstaller" and it had over 850MB of "automatic backups". WTF? Why does that app do any backups anyway? I use Titanium and Nandroid so I don't need apps doing anthing "automatically" without my say so.
Thanks to the suggestion for the above disk apps, I saved almost a gig or storage. I use the No Bloat app exclusively now to remove system and user apps that I can't get rid of any other way.
Maxwell was the first "Smart" phone user.