Stephen Vider, a graduate student in the History of American Civilization at Harvard, has created an excellent blog called The Lazy Scholar; a "not-quite-daily guide to digital archives in American history, literature, and culture."
As Vider notes, "every Monday, Wednesday, and Friday, The Lazy
Scholar provides a lively description of a single online
resource--ranging from art and music to film and literature, 18th
century to the present. Some recent posts have covered topics like
Disability Studies, the Gay Liberation Movement, Lincoln memorabilia, and much more." It's well-written and well worth checking out.