For many DAWs such as Fruity Loops or Ableton Live, it is very easy to find project files: on newspaper cds or on the Internet.
They are very useful as a learning tool as well as as a creative tool.
Even if not everything works, for example because of dependent VSTs / VSTI that were used to create the project, but that the learner doesn't have on his/her computer.
 
Do you know of such resource repositories for Sonar ? If so can you please post a link ?