Videos
This is a little odd, but fun too: a silent educational film from the 1920s about Longfellow's life. Kind of like an old-timey filmstrip.
These are a really big fad on the internet, although we're not exactly sure why. A little creepy, but it's a good reading of the poem.
Images
A nice painting of a youngish HWL.
A photo of the poet as an older man, looking a little cranky.
Books
Here's a scanned version of the anthology in which "The Day is Done" first appeared. It's worth a look through to see how this poem looked in the original.
Websites
A web version of a museum exhibit, filled with cool facts and images form Longfellow's life.
A website dedicated to Longfellow, created by the Maine Historical Society. Here you can find a bio, the texts of many of his poems, and other resources.