It differs from other defrag tools on the market, by enabling you to quickly and simply defrag the files you want to, without having to process the whole drive.
portable usb-stick version also available. From lifehacker.com: "...Revo Uninstaller makes removing programs from your computer—not just uninstalling, but removing all traces—a quick and painless process. ...the default Add/Remove is notoriously slow at loading all of your installed apps; it also ...doesn't necessarily eradicate the program to your liking."