TareasPlus is a free service that creates and provides high-quality math and science instructional videos in Spanish. Currently there are over 1134 videos available. Spanish immersion and advanced Spanish teachers may make good use of this content for their classes, and ELL/bilingual teachers may welcome the Spanish-language content instruction.
TareasPlus is available at http://www.tareasplus.com
Read a review of this service at http://venturebeat.com/2012/11/08/tareasplus-helps-latin-american-students-master-math-and-science