Also, the developer of paint.net is a microsoft fanboy who guards the source code of the program so paranoidly that it's almost impossible for anyone other than a select inner circle to create plugins for the software, as there's no decent documentation of the api or anything, and then he also places silly artificial limitations on what plugins are allowed to do, because they "don't fit his vision" or somesuch crap. It's quite ridiculous. I was using xp at the time, and I finally abandoned paint.net when the developer said that the next version would no longer support windows xp, regardless that xp still had the majority of market share on the windows side back then. Then I switched to gimp, and pretty soon after that, to linux. The culture of freedom around GIMP was so refreshing after all that garbage, that it encouraged me to seek the same freedom in my operating systems as well.
People badmouth gnome and gimp developers for not listening to the users or some crap, but those people are just spoiled, they should go take a look at the small-mindedness of developers of closed-source software to get some perspective...
Anyway, on topic, it's good to see my favorite painting program getting another update. I'll be looking forward to using it.
Also, to those badmouthing gimp here, Krita may seem like it's ahead of gimp in functionality - and on many areas, it is! But Krita isn't perfect (although it is a great program): it is also suffering from some bugs, there's slowness in other areas - like development of decent documentation, which on the other hand is excellent on the gimp side. There are also some features that are far more advanced on gimp. The point is, that these programs complement each other, they both have their strengths and weaknesses. And GIMP's development is far from static, it may seem slow at times, but GIMP has tended to have a longer release cycle because they dump a huge batch of new features in each new point release - whereas Krita's releases have been much more granular. That's also changing, supposedly - GIMP developers have planned on shortening their release cycle, but we'll have to wait and see how that pans out.