I've been using Paint.NET for a while now and I have to say that this is a definite improvement. What I use this program for requires me to select and deselect areas excessively, and more complex area selection operations could cause my computer to grind to a near halt sometimes, especially if circle select was being used. With this update, I can do all sorts of crazy selecting without any concern for overtaxing my processor.
Nice job. As soon as digital matter transportation technology is developed, I will email you a pizza.