For many of our reports, we've been using FOP (Apache's XSL-FO implementation). It's an XML format, similar to HTML, with stuff like page masters to help with

For many of our reports, we've been using FOP (Apache's XSL-FO implementation). It's an XML format, similar to HTML, with stuff like page masters to help with layout. We generate the XML with a velocity template, feed it into FOP, and which generates the PDF.