A collection of online maps provided by Yale University Library. It seems it might require a plug-in to view them. It seems they are in the process of digitising even further so the collection should grow.
These are really useful - I use The "End" of Reconstruction in class because Prof. Blight lectures effectively on topics such as the 14th and 15th amendment, Frederick Douglass, precedent setting SC decisions such as Slaughterhouse & Cruikshank. Blight uses some humor and is a phenomenal storyteller who effectively links past to present.
YouTube is initially applying the captioning technology only to a few channels, most of them specializing in educational content. They include channels from universities like Stanford, Yale, Duke, Columbia and the Massachusetts Institute of Technology, PBS and National Geographic, and Google itself - its corporate videos will be captioned.
This looks like an absolute treasure of a find, however the list does not lead to actual image, only descriptions of artefacts. They say they're still adding to it, perhaps that's why the images aren't up? I guess the pace of change is slower for classicists. Anyway, if they ever add those images this site will be an Ancient History teacher's dream. Fingers crossed.
This is a collection of images on flickr of manuscripts, mostly it seems from the seventeenth century. It's maintained my a rare book and manuscript library at Yale.
Podcasts of lectures provided by academics at Yale. At the moment they only cover the ancient Greeks, the US Civil War and France after the mid-C19th, however it should grow over time. I think most of these can be subscribed to on iTunes.
This is a thorough and well-organised collection of sources related to legal history. Quite useful for any political, legal or even just general historical research.