I've started a page linking to videos about U.S. history. There are lots of videos on Biography.com and other sites that students can watch on their computers. The videos can fill in a lot that the textbooks don't, and in a livelier, more engaging way.
It's pretty cool that so much is available. You can see FDR giving his first inaugural! You can see Martin Luther King deliver his "I Have a Dream" speech at the March on Washington!