MySQL is a SGBD very well know, and many people know how ‘use’ it. The PostgreSQL SGBD isn’t so well know as MySQL, and many people just heard about :). With this fact, a little ago, I started to develop some introductory slides targeting people at Lightcomm, company where I live 8 hours/day.
The slides is really introductory, so people that know PostgreSQL probably isn’t much interested, but engine behind scenes is engine used in slides at html5rocks.com, entirely based in HTML5 / CSS3 / JS … Actually I developed and used it very well in Chrome, and result is really great!
Development of slides are very very comfortable, finally, is only HTML / CSS. The slides at html5rocks.com come with samples about use of video, audio, SVG and other things, very useful in more complex presentations (let’s say something about Django). I really adopted this method of create slides, their code live at github  and you can dowload a tgz/zip file  🙂
I really suggest you to try. Who are interested, I really like ideas of translations (they are in brazilian portuguese), improvements or that you show-me bugs 🙂