"A listing of over 5000 websites describing holdings of manuscripts, archives, rare books, historical photographs, and other primary sources for the research scholar. All links have been tested for correctness and appropriateness."
Parallel Archive (PA), an "invented" archive repository accessible for everybody wishing to upload primary sources, is developed by the Open Society Archives (OSA) at Central European University in Budapest, Hungary. PA is, "at once a personal scholarly workspace, a collaborative research environment, and a digital repository".
"This is a collection of hyperlinks to digitized editions of source-documents and literature concerning early medieval Europe that can be found on the internet today. Sources listed here are all available to the public, free of charge. Currently there are 3696 entries in this collection. "
PrimaryAccess is a suite of free online tools that allows students and teachers to use primary source documents to complete meaningful and compelling learning activities with digital movies, storyboards, rebus stories and other online tools.
Contains many useful tools and services for history teachers. There are online experts for tutoring and some good-quality sources. Looks like it's going to get even better. Some of the sites there look brilliant.