If you're looking for a solid drawing and image editing program for Gtk, have a look at Pinta. This week's point release brings several new improvements, a batch of new tools, and a facelift to the GUI. Modeled after Paint.NET, Pinta makes a great lightweight alternative to GIMP. It works on Linux, Mac OS X, and Windows, and has enough features to get all but the heaviest of editing jobs done. Pinta sports several drawing tools, including Pencil, Eraser, Shapes, and Paintbrush. It supports an unlimited number of layers and unlimited levels of Undo/Redo for those times when you realize you made an editing mistake several steps back.