Transferring emails to another mail client!
This is actually a simple way of transferring a few emails from one computer to another or from Mail to another application. It will also let you preview the file in Quick Look (it doesn't work well in a text editor). A lot of cool things can be done by simply dragging things around in OS X and the same is true with Mail. You can easily drag an email from Mail to the desktop or any Finder window. It will then be readable with Quick Look or just by reimporting it in any mail application.