THE genealogy web site of the LDS Church. Includes the ability to search the IGI, the Ancestral File, the Family History Library Catalog, and web site submissions. Also has user mailing lists, online ordering of FHL research materials and allows you to preserve your own research online.
User Submitted Genealogies is a set of lineage linked conclusion trees provided to FamilySearch by users. This data comes from the Ancestral File, the Pedigree Resource File and other user submissions.
'Ancestral File' and 'The International Genealogical Index' are, probably, the most widely used genealogical reference sources. Unfortunately, they are also two of the most common sources of erroneous information.
Free WIKI style website that is organizing all the IGI's batch numbers for the entire country of Mexico by state, town and year. Bilingual site also explains how to use batch numbers more effectively in searches.