It is a very common usecase to display a list of nodes on a page, and one or more blocks that give you the ability to filter by tags or categories. You might encounter such a use case on a "blog posts" or "event list" page. And it would be nice if the filtering wouldn't require a full page reload, but rather just inquire the server for new information, and update the list of content via AJAX.
All Drupal projects that I have worked in the last time, are using large images on their home pages inside slideshows. This trend remains actual as these large images make an impact and rests one of the most essential part of a website.