Paint.Net is simply amazing.  When I first saw the program I knew then that the .Net framework was ready for primetime.  Paint.Net has the look and feel of a professional commercial application—something that is not easy to do and requires the right tools (which is why I had been a die-hard Delphi follower). 

For a great overview of the history of Paint.Net, see http://en.wikipedia.org/wiki/Paint.net  and to read about the latest development efforts, check out the blog: http://blog.getpaint.net/

I was a saddened to learn that the source code was pulled, but based off of this post (http://blog.getpaint.net/2009/11/06/a-new-license-for-paintnet-v35/), it does make sense.  It is a shame when noble acts are abused by profiteers.

Again, kudos to Rick Brewster for this great MS Paint replacement.