If you are new to xml as I am every little piece of information is helpful. Here's a tip I figured out that I wanted to pass on. In order to keep your custom right click tools seperated out from the built in context menus you can add two more xml files in the directory in which you have already added a custom xml file. Give the files sequential names like filename1, filename2 and filename3, using the two separator files as numbers 1 and 3. For the content of the separator files use the code I have inserted below and you will end up with your menus seperated out like the screen shot here.
Here's the code to use in the seperator files:
<ActionDescription Class="Separator">
</ActionDescription>
Now wasn't that easy?