I would like to have DMailer evaluation copy comming bundled with the operating system by default. Leave the decision of buying the paid version on the customer. The application DMailer is nice piece of software which allows you to sync and backup your settings and file from your computer under a profile and then you can have all your files with you whereever you go in the usb drive and all you need is a computer to work on thus saving you from carrying a laptop arround.
This softare comes bundled with the Sandisk version of U3 launchpad portable OS.
The Dmailer software can be downladed from this link.