One feature of QuarkXPress around since the early days is Save Page As EPS, located on the File menu. The major drawback to using this feature, though, has always been that fonts aren’t embedded. Consequently, sharing or trying to RIP that EPS caused font substitution, which, in an EPS, is a real mess.
QuarkXPress 7, however, makes much better EPSes.
From the File menu select Save Page As EPS, set the file name, choose the page to be exported, but don’t hit the Save button just yet. See the Options button at the bottom of the dialog? Click it. In the new, multi-paned Save Page As EPS options dialog, go to the Fonts pane. There, you will find all fonts in use on the page-that-would-be-EPS. Any missing fonts show grey and in parentheses. Check all the fonts you want to embed in the EPS–which, for maximum compatibility, should be all of them. Click OK, and Save.