Only in the the last few years have I used a Mac as my primary computer.  I still consider myself very tech agnostic though, and still use Windows with regularity and Linux every now and then.  One of the programs I found myself missing the most when I moved to Mac OS X (besides Minesweeper) was MS Paint.  OS X lacks a stupid-simple image editor/basic drawing tool.  That’s why I was so glad when I found Paintbrush.