NOTE: This plugin is incompatible with Paint.NET 4.0. Use the most recent version found here:
This plugin integrates OptiPNG with Paint.NET. It optimizes PNG to make them smaller, which is good for web use. Compiled DLL: OptiPNG plugin.zip
Both the DLL and optipng.exe need to be in the FileTypes directory.
November 30 - updated to OptiPNG 0.62, some minor changes suggested by antond