1) in order to generated chunked html directly
    XHTML_XSL=http://docbook.sourceforge.net/release/xsl/current/xhtml/chunk.xsl

2) to obtain a better pdf, package db2latex-xsl

3) write a separate XSLT that includes the standard one

4) have a look at:
    svn checkout svn://svn.debian.org/svn/ddp/refcard/trunk
    http://people.debian.org/~debacle/ (thanks Debacle!)