This is a port of HTMLDOC, which can:
   Convert HTML files to PDF or PostScript 
      Generate a table-of-contents for books 
      Generate indexed HTML files 
      Generate files on-the-fly for web applications, from the
	command-line for batch jobs, or from a GUI for interactive work. 

   HTMLDOC Provides
       A command-line interface for batch and WWW applications. 
       A graphical interface for interactive work. 

In my opinion, HTMLDOC is *fast*, compared to the other solutions I've seen.

HTMLDOC is available under the GPL.
Commercial support is available from the author.

WWW: http://www.htmldoc.org/