Another great read from Eric Karjaluoto @ smashLab: http://www.ideasonideas.com/2009/11/the-taxi-scenario/
You can use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>