I would start with the home page, which is easy to deconstruct and gives the most timely content. The Navigation bar at the top right is an easy way for users to access all the content area with a click of the mouse.
On the page, itself, users can get a quick glimpse of what's on for the current month in the dynamic lead, the Best of Web (all our 300+ websites have been reviewed by teachers and an internal NEH panel for their quality and usefulness), our NEH Connections (NEH-funded content appropriate for the K-12 classroom); our calendar (below); and our Feature of the month, which is a new part of the site and highlights special months and special teacher resources. The latter has just been finished and we are still populating it with our 60 features and the type search has not yet been put into action. It will be soon.
Next, our calendar has gotten a lot of interest from teachers. It can be searched by area and leads to timely resources from the rest of the site, as well as Thinkfinity.
The Lesson Plans section (we have over 500) has subject areas with drop-down menus to refine the interior search and that let users check to see if the lesson plan is part of a larger unit and if it has worksheets. The lesson plans, themselves, are chunked up to by tabs to give users a choice--either the full plate or just bits, and also contain basics such as time periods required as well as a tab for resources, which contain worksheet and interactive links.
Student Resources (see the Nav Bar) is the gateway to interactives that either can stand alone or are linked to the teachers' versions of lesson plans in the form of Launchpads. There are many that have a definite wow factor and some of them are also linked to more information on what to pair them with.
Here are two items that you could use as special interest items:
The educational history game, Mission US: Flight to Freedom http://edsitement.neh.gov/student-resource/mission-us-2-flight-freedom
and one of our customized teachers resources: the Guide to Black History Month Teaching Resources, which is a cornicopia of great content for that important month.
Let me know if you would like any more on this.