Pathauto used to include a feature for "Index Aliases" which would make it so that a site with a URL system like "blog/2008/05/15/content-title" then it would show teasers of the content at "blog/2008" for content which had aliases that started with "blog/2008". There were some performance problems with this feature and, with the advent of Views it was no longer necessary.
Note that the Breadcrumbs are somewhat incorrect in the video. This was due to an oversight in creating the view. If the view included a "Page Title" or used the "Page Title" field for the Arguments.
Video licensed cc-by-sa by Mastering Drupal.