As you can see from the picture above (click on it to enlarge), Google has added the URL of the site mentioned in the knowledge graph, when the query is navigational.
So searching for [fox news], [pbs], [yahoo], [bp] and other brands, you will see their knowledge graph panel with their URL.
In addition, you can search for popular musicians/artists such as [neil young] and get the artist's official web site in the knowledge graph.
I am glad Google added this URL, it makes the whole swiss army knife analogy feel a bit better.
I first covered this at SEL based on a hat tip from Rahul Mistry from http://bluepostdigital.com.
Forum discussion at Twitter.
This post was pre-written and scheduled to be posted today.