New Private Message Feature:
Another new thing that Slick mentioned is that you can export all you Private Messages to a file - and you can choose whether you want it as a plain text file, an XML file or CSV. That's way down at the bottom of the screen that you view your PMs in. And then, if like me you're constantly filling up your PM box, you can go back and delete anything knowing you do still have it!

You can do that with ALL your Private Messages, or just with ones you have selected.