Crusades at Sourcebook Primary sources (translated), with secondary materials and links.
Solomon bar Samson A Hebrew account of the First Crusade.
ORB Crusades Contains extensive bibliographies and original essays.
Labyrinth Crusades Offers primary and secondary sources, links and maps.
Medieval Christian Spirituality Not exhaustive, but plenty of primary and secondary materials.
Islamic Sources Primary source site for history and thought in the Islamic world.
Cornell Middle East Studies Primary and secondary sources for the Crusades and Islam.
Keep the names and dates straight.