I know many times questions on jobs in Madrid, here is one a friend there alerted me to ,and thought to publish it here for all,hope it helps

(in Spanish)
http://www.educacion.es/exterior/usa/es/programas/auxiliares_us/aux_us.shtml

(in English)
http://www.mec.es/sgci/usa/en/programs/us_assistants/default.shtml