Have Lutheran ancestors? I found an interesting Q & A on the Lutheran Church Missouri Synod website about genealogy. The question had to do with tracing Lutheran ancestors, the answer provides information on what records might be found at a local parish level (baptisms, confirmations, weddings and funerals). In addition there is some information about the Concordia Historical Institute and publications they have about researching there and researching your genealogy.
The Concordia Historical Institute is located on the grounds of the Concordia Seminary in St. Louis, Missouri. Their website provides access to their holdings including their archives which is one of the "world's largest repositories of information on Lutheranism in North America."
By scrolling down the homepage you will see a link for Lutheran Church Records Online. This appears to have some great links related to Lutheran Church Records and German Emigration. An important stop in learning more about researching Lutheran ancestors.