Quote - I searched a bit but... how do the user from MAC get a compiled version of PIL ? I'm on PC and, for Windows, the compiled version exist. For what I know, there is no compiled verison for Mac to download.

It's all done from the source package, plus dependancy installs AFAICT -> http://tomster.org/blog/archive/2005/10/13/pil-on-mac-os-x
I don't know enough about the different Mac binary formats and OS versions to comment on whether or not providing a precompiled library is possible, sensible, or even desirable.