If you've never checked out the NAACP papers at the Library of Congress--I blogged about them a little while back--here's a chance to do so without leaving home. The Library has put a bunch of materials in an "online exhibition." The selection of documents (70, with more to come) is only a tiny fragment of what's available, but it should be enough to whet your appetite. There's also an online collection of primary sources aimed at secondary school educators, which is pretty cool. If you're unable to get to DC, remember that most of the collection was microfilmed awhile back, and is in many a research library collection. I prefer the actual ink-on-paper myself--microfilm is no proper replacement for holding W.E.B. Dubois's hand-scrawled letters in one's greasy little hands.
And yes, I learned about this exhibition because I'm a "fan" of the LoC on Facebook. Which is only slightly less nerdy than being a fan of JSTOR, which I also am.
4 hours ago