Adoro questo programma... 
Some important bug fixes, and
the Curves adjustment is actually useful now (not to be confused with the
Line/Curve tool).
Here's the list of changes since Beta 1:
Curves adjustment is now much, much better
AD/GPO deployment now possible by using the /createMsi parameter with the installer
Fixed another layout issue with the Layers window
Fixed several "SetupNgen" crash errors during setup
Fixed a performance issue with the Pencil tool
Fixed a crash when the user cancelled out of the Scanning wizard
Fixed crash related to images with 0 dpi
Lots of other misc. bug and crash fixes
Fonte: Paint.NET v2.6 Beta 2 is now available