Immigration to Mexico from Spain

["Arturo Ramos" <arturo.ramos2@...>]

Has anyone attempted to find their ancestors' immigration records from 
Spain, i.e. ship passenger lists of immigrants to Mexico, etc.

>From what I have been able to tell, the best bet is the Catalogue of 
Passengers to the Indies published by the Archive General de las Indias 
in Seville... Catalago de Pasageros a Indias... compiled from Libros de 
Asientos (Books of Seats) of the Archivo General de Indias in Sevilla)

Anybody have any better ideas, or know if these catalogues are indexed 
electronically anywhere?