Another paint.Net plugin I have recently found is the PrintIt plugin which can be downloaded here
Download and unpack the zip file. Two of the enclosed files (OptionBasedLibrary*.dll/.dlc) go in the Paint.NET folder (mine is at C:\Program Files\Paint.NET) and the other two files (PrintIt.Effect.dll/.dlc) go in the usual Paint.NET/Effects/ folder.
While we are on downloads and zip files can I recommend 7Zip if you do not already have it? It is the best tool for handling all of the compressed archive files out there. Give it a try by downloading a copy now.