However, that email component is secondary to the main strengths of File Magic. This app allows you to easily move files, with both the iPhone/Touch app and the desktop app (Mac/Windows) open, from your desktop to your iPhone, or just via the iPhone app from iPhone to iPhone. These both work as long as both devices are on the same wireless network or accessing a WAP on the same network. You could just use the File Magic app on the iPhone/Touch as a data transfer-and-storage app if you wanted to.
But, the File Magic app on the iPhone/Touch also allows you view several different file types, some of which are not native to the iPhone or iPod Touch. If you move a Word doc, a MS Powerpoint presentation, an Excel spreadsheet, or an Adobe PDF file to the iPhone/Touch, you can view it through the File Magic app on the device. Pretty sweet!
You can find out more about the $4.99 app here if you are interested:
http://www.splashdata.com/filemagic/ or in the App Store in iTunes.