I just found this terrific set of materials on Abraham Lincoln's Illinois years (1830-1861) curated by Northern Illinois University's library. It's called Lincoln/Net.
videos you could show your students, with lectures from scholars like Eric Foner and Edward Ayers.
Maybe the best feature on the site is its list of 15 lesson plans. They relate specifically to Abraham Lincoln (like the two lessons on the Lincoln-Douglas debates) as well as topics about the antebellum era (like the ones on Cherokee Removal and the Dred Scott decision).