(very much under construction!)
LIBRO: The Library of Online Iberian Resources
ArchNet: Islamic Architecture Community
The Jewish Virtual Library: Sephardim
Architecture in Christian Spain
Metropolitan Museum of Art's Timeline for the medieval Iberian Peninsula
The Online Bible (King James version)
The Hebrew Bible in English (according to the JPS 1917 Edition)
The Labyrinth: Resources for Medieval Studies
New York Times article on medieval Muslim mathematical designs
For those who read Spanish: the Museo Sefardi site (Toledo, Spain)
Downloadable Passover Haggadot