We just posted a one-day Lab on the DSL Tools on the Code Gallery : http://code.msdn.microsoft.com/DslToolsLab

The idea is that, if you complete this Lab until the end, you'll be able to create your own modeling graphical designers using the DSL Tools technology, and the code generator that will generate code, documentation, configuration files or whatever textual artifact you want, from the information that is entered by the designer user. This will probably take you one day to complete it, but it's really worth it !