I didn't see any previous topics that discussed this guide so I hope I'm not bringing something forward that's already known to members. If it's already out there, it never hurts to remind everyone.
At over 1000 pages, The new Guide to the Archives of the Church in Spain, the first volume in the collection of «Computer Tools for Consulting Church Archives in Spain», contains a detailed and updated description of the one hundred and sixty largest ecclesiastical archives in Spain (cathedral, diocesan, monastic and convent)and also of the 23,000 parish archives belonging to the sixty seven dioceses of the Church in Spain.
Hopefully this aids those of you that may be able to trace your ancestors to Spain.
A pdf copy of the guide was too large to post and can be found at: http://www.mcu.es/archivos/docs/ArchivosIglesia.pdf