I realize this is a very basic example, but it might be helpful for new implementers looking for a basic page layer example, or for anybody that just wants to add some basic html to Q2A pages.
You can edit the -layer.php file to alter where the custom html appears and on which page types.
The package is hosted on Google Code which I have just used for the first time, so hopefully I got it right.
Comments are welcome.
Here is the project url.