Various 'macros' have been written to allow external postscript files to be incorporated into LaTeX documents. This is most useful when one wants to include graphical information such as figures, logos etc into the document.
Certain of these macros are also supported by
(or rather work successfully/recommended with)
latex2html. Furthermore latex2html enables
additional author-flexibility of how & where the 'figures' are
displayed in the resultant html document.