Converting Postscript or Encapsulated Postscript files to PDF usually requires the use of Illustrator or Acrobat Distiller. Recently, I opened a .eps file by double-click, and that launched Preview. A progress box appeared, displaying conversion from PostScript to PDF. The conversion completed and the file was displayed in Preview, ready for save as/export.
This is a great solution for people who need the functionality without the cost of a third-party app.
App: Preview 3.0.1
System: OS X 10.4.2
[robg adds: THis also works in 10.3...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050818225157738