The examples you've thrown up sound like good questions to have at SU. 

There're are a few questions like that already on there and they're taken to warmly. Even solved in some cases.

Questions about Paint.NET are no more specific than [questions about Photoshop][1] or [a Mac mini][2].


  [1]: http://superuser.com/questions/tagged/photoshop
  [2]: http://superuser.com/questions/tagged/mac-mini