A listserv hosted by the Society of American Archivists which allows for a broad discussion on a wide variety of archives-related topics and questions.
A list compiled by Northwest Archivists in 2011.
NWDA provides access to descriptions of primary sources in the Northwestern United States, including correspondence, diaries, or photographs. Digital reproductions of primary sources are available in some cases.
A variety of online topic-related groups hosted by the Society of American Archivists.