According to NACo’s blog article,
But this new site isn’t just eye candy–it’s easier to navigate and find exactly what you’re looking for. It takes a topic-centered approach to the information architecture. If you’re interested in a particular subject, our goal is to make it easy for you to find everything we have on the subject (as well as convenient links to related information). A “persistent” navigation bar always stays on the screen so you’ll never have to scroll back up to the top to get to other parts of the site.
Speaking of the navigation bar, if what you’re looking for doesn’t jump out, try the unique search function, At first glance it looks like your average search box, but when you click on it, you get a full-screen “Explore” feature that includes links to key areas of the site (as well as a sophisticated search engine that works as you’d expect it to).
We’ve also enhanced the user experience. A simple ‘filter bar’ appears throughout the site to let you quickly identify the type and topic of information you’re looking for, right there in the page. Results can be toggled between list and grid views, depending on your viewing preference.