Hi, a while ago I had put together some Mallard-based documentation for Xfce-Screenshooter, but I never got it properly out.  I've put the sources into a gitorious repo for now.  

The repo is located here: http://gitorious.org/xfce-docs/xfce-screenshooter

For now you need yelp installed to view the files, but they can be built to html.  To get an initial look from yelp, you would navigate to the help folder, then issue the command "yelp C/".  

The images for the "notes" don't display right now, but I'm not sure why.  I need to figure that out.

I hope this is still helpful!