Links to every useful resource I have found in my family history research relating to my ancestors from or in Germany will be listed on this page (so as not to lose track of something helpful). Hope you find something to help you, too.
Ancestry.com - subscription database of family history databases. Massive amount of content.
FamilySearch.org - free family history and genealogical records database- Church of the Latter Day Saints
Cyndi's List - Germany - Links to Germany specific websites/information. free comprehensive, catagorized, and cross-referenced list of links to genealogical research sites online.
German Genealogy Online - Links to online German genealogy databases and resources.
German Genealogy - History and a whole bunch of links and resources
Wikipedia: History of Baden-Wurttemberg
Understanding Your Ancestors - context of their lives, western Europe, particularly Germany
LandesArchive Baden-Wurttemberg -Emigration From Southwest Germany - (Note: Website & search forms largely in English, results in German - of course), records of people who emigrated from the Baden-Wurttemberg; also links to further databases and resources with phone numbers and email links
Online German Immigration Records, Lists and Indexes
German and American Sources for German Emigration to America
LE HAVRE, FRANCE (I know it's not Germany but it's the port my German Ancestors left Europe from, so I'm putting it here)
Le Havre, France as Emigration Port
"A Look at Le Havre, a less known port for German Immigrants" , 10/9/11 post by Kathy Gosz, of the Village Life in Kreis Saarburg, Germany blog
"Emigrants Setting Sail: Questions and Answers," 2/28/14 post by Kathy Gosz, of the Village Life in Kreis Saarburg, Germany blog
GERMANS IN AMERICA
Chronology of Germans in America (Library of Congress)
German Immigrant Ancestors in Syracuse and Onanadaga County NY - lot of information
Wikipedia: Germans in Syracuse NY
Understanding Your Ancestors - Who Came and Why: German Immigration
Mennonite-Amish Mega-Search Engine from Many-Roads.com