http://code.google.com/p/wkhtmltopdf/
Description
Simple shell utility to convert html to pdf using the webkit rendering engine, and qt.
Introduction
Searching the web, I have found several command line tools that allow you to convert a HTML-document to a PDF-document, however they all seem to use their own, and rather incomplete rendering engine, resulting in poor quality. Recently QT 4.4 was released with a WebKit widget (WebKit is the engine of Apples Safari, which is a fork of the KDE KHtml), and making a good tool became very easy.