Information is the sole reason people visit your site. Making certain your information is accessible, searchable, categorized and available, and that your design doesn’t interfere with that, is a critical element of your user experience.
We need to teach people that information architecture (IA) decisions are just as important as the look and feel of technology stack choices. We need to teach people the importance of semantics and meaning. We need to teach people to look past the way the rest of the web is structured and consider instead how their corner of the web can be structured to support their own unique intentions.
Source: The Pain With No Name http://alistapart.com/article/pain-with-no-name