universitäts- und stadtbibliothek köln (2007)
Accessibility was an important requirement for this website as it belongs to a public institution. It involved converting it from a table layout to a CSS based layout and using semantic markup throughout the page.
Consequently having a cleaner separation of markup and presentation made it a lot easier to adapt the design to the new corporate design of the university. The prototypical implementation only took about one day and we were one of the first websites of the university (and actually one of the biggest) which adapted the new design.
Link: Universitäts- und Stadtbibliothek Köln (German. Library of the University of Cologne)