I m working on the new version of Notepad X, i hope it will be available at the end of the month.
You can see the list with the updated features at the forum.
Some of the new features are the multiple document editors here you can see how its possible to select one of the currently available editors
Here is the ScintillaNet editor whitch features code hightlighing like the ICsharp text editor
Also many of the problems of the applications fixed and the plugin development made much better
check this post for the mouse gesture plugin experiment.