Paint.NET v3.22, Beta Released: December 28th, 2007, Download
This release fixes a few minor bugs and adds a new, much-needed Reduce Noise effect.

New: "Reduce Noise" effect.
Changed: Ctrl+W will now close Paint.NET if zero images are open.
Fixed: In Windows XP, when launching web content, sometimes Internet Explorer was used instead of the user's chosen default browser.
Fixed: Unfocus was not handling alpha values properly.
Fixed: Brightness / Contrast adjustment was only displaying its text in English.
Fixed: The /auto parameter for the installer now correctly allows for an automated installation. This was inadvertantly broken in 3.20.