I view (and use) this resource much like I do YouTube videos. It contains a massive store of diverse resources to use to explain or enhance lessons. I really utilize, and find success in capturing the kids' attention, the primary source resources history.com has--videos and pictures of old speeches and battles, original copies of documents. Doing so helps the kids relate the information, which may seem abstract to them, to actual, real-world things and occurrences!
This article talks about project-based learning and how engaging the students in learning they actually gain wider and deeper knowledge of the topic. It talks about how project-based learning is also a great way to incorporate technology.