Today I found a very nice cross platform Paint.NET program clone with the name Pinta.
Now I can edit images on every platform (OSX, Linux & Windows) and use always the same interface and hotkeys for the few times a year I need a simple paint prgram.
When you install the software under windows do not forget to install the “Gtk# for Windows“. Without the GTK the program don’t start and don’t give any error.
You can find the software here: http://pinta-project.com/