Following my odyssey to find a near perfect Gutenberg automatic conversion method for the Sony Reader...
This program gutlrf.pl (a Perl script) which, along with
libprs500 (that library does the hard work), converts Gutenberg HTML books into BBeB LRF (Sony's eBook format) books for the Sony Reader. The process is designed so that no manual editing of the HTML files is required, it even downloads the files for you. It can also convert text based Gutenberg books with the help of Gutenmark.
The gutlrf.pl script will retrieve, extract, clean, extract the author and book title and then call HTML2LRF (which does the hard work) to convert into an BBeB LRF file with support for Markup, Images and Contents. It tries to put new chapters onto new pages - which is usually based on the H2 HTML tag. Sometimes the Gutenberg ZIP files don't always contain the correct directory structure, gutlrf.pl will automatically fix this.
There's full instructions inside the ZIP file.
Download it from here