I think it is
difficult not perfectly smooth to navigate the StackOverflow.com site. Next to the logo, there are a number of major categories: Questions, Tags, Users, Badges, and Unanswered. And in every category, there are a number of subcategories, displayed as tabs (e.g. newest, featured, hot, votes, and active under major category Questions).
- Shouldn't the major category Unanswered rather be a subcategory of Questions?
If you ask me, "unanswered questions" should be treated as "hot questions" and "questions with many up-votes /and few down-votes/". Also, if you click a tag on the main page (which belongs to no major category at all), you end up at a tag main page. But the subcategory of this page (newest, active, ...) depends on the last tab clicked, and hence is not part of the URL. This is slightly confusing. To make it worse
- On this tag main page, there is a third toolbar of links (about the ... tag, faq, stats, hot answers, ...), but the links are confusing.
If you click e.g. "new answers", you end up in the Tags main category, and thus you leave the Questions main category by clicking link on a "third-order" navigation toolbar.
Also, it is not entirely self-evident that http://stackoverflow.com/tags/delphi/new is a list of all new answers tagged Delphi, whereas http://stackoverflow.com/questions/tagged/delphi is (if you select the right tab!) a list of all new questions tagged Delphi.
It might be usable enough, but the navigation feels rather unstructured.