Hi,
Here's a little feature I found today while editing a song in my songbook - I made several changes and previewed my changes without saving anything. At one point, I was a little confused and needed help on the markup language format. I pressed help and after the help screen displayed, all of my previous changes were gone! Fortunately, I pressed the back button on my browser (IE) and found my changes intact. I promptly saved them and then referred to help.
Moral of story - save save save but if you screw up go back!