ActiveHistory podcast database - Searchable, either type in keywords, or keep clicking on the red search terms to cycle through possible options
A Student's Guide to the Study of History - If you have ever thought about why we study history or how the skills needed to succeed in history differ from those in other disciplines, this guide will be a useful resource.
British National Archives - Millions of electronic documents gathered by UK government offices and courts.
CIA Electronic Reading Room - Eleven million (!) pages of declassified CIA documents, organized by collections, and searchable.
Churchill Archive for Schools - Wide-range of resources for building historiography skills and knowledge of 20th century Britain, especially, and beyond. Includes access to a wide range of Winston Churchill's primary documents and correspondence.
C-SPAN Booknotes - 800 interviews with non-fictions writes (mostly historians), searchable by keyword or organized categories; interview transcripts or videos of the interviews are available.
Economist Intelligence Unit - A reliable, current resource for in-depth country reports on political and economic information.
Global History Review - A useful website for reviewing major time periods, ideas and concepts in world history.
Hip Hughes World History - A playlist for explanatory (and somewhat entertaining) videos about varied topics in world history.
History Extra (BBC) - Official Website of the BBC History magazine with articles, links, quizzes, podcasts, and more.
Howstuffworks.com - History - Brain candy: articles, quizzes, etc.
Inquiries Journal - History - Free database of academic articles
Modern History Sourcebook - Incredible site for primary resources from all corners of the globe. History is divided into sections and subsections, Reformation to the Present, as well as historiography skills.
Stuff you Missed in History Class Podcast Archive - Hundreds of free podcasts on diverse history topics
The History Teacher - Publishes inspirational scholarship on traditional and unconventional techniques in history education