Who are the Sephardim? provides a short history of Sephardic Jews. The Ladino language website has a more complete introduction to Ladino, the Judeo-Spanish language. Included are a brief descriptive grammar, stanzas from Joseph the Wise, a long Ladino poem, and a translation of The Story of Gerineldo, a folktale. There are very good primary sources at the Medieval Sourcebook, and a Yahoo Ladino discussion group. This essay about the interactions between Moorish and Jewish cultures and their collective effect on European culture seems quite good (and is in Spanish). See also this Spanish-language article about exploring Ladino. There are more good Spanish-language resources on Sephardic history here.