On a Macintosh, epsConverter can convert postscript files to Adobe Illustrator (AI) format, and then AI can be used to edit the resulting file. (Windows Paint-Shop-Pro might also do it ?)
However, you might only want to import a postscript file and then add captions etc. There are many page layout applications that will do that eg Mac/PC Pagemaker - or even MS Word I believe :-)
If you only want to view it on screen use Ghostscript as Carsten said (for both Mac/PC).
Alan Hewat, ILL Grenoble, FRANCE <hewat@ill.fr> tel (33) 4.76.20.72.13
ftp://ftp.ill.fr/pub/dif fax (33) 4.76.48.39.06 http://www.ill.fr/dif/