PDF mirroring

Pdf-mirroring in 4 steps under Mac OS X. Simple, fast and efficient - only for geeks.

1. Save a PostScript file from Preview (Print, then choose Save a Postscript from the menu)
2. Open the file in a text editor (not a wordprocessor!)
3. Paste the following code after 'end put' (at the beginning):
   
<<
/Install {
currentpagedevice /PageSize get 0 get % get page width
0 translate -1 1 scale % translate to (maxX,0) and mirror
}
>> setpagedevice
% ---- end mirroring prefix

4. Finally open the .ps in Preview and save the PDF file.

That's all, but I digged the web till I found it.