Genealogy blog
I came across a good collection of articles and resources at the Jewish section of Genealogy Blog. I may post a few that are relevant to our search.
For example, here is a detailed report about a genealogy success story, in which long lost branches of a Jewish family in Maryland, Uruguay, and the Netherlands are reunited through the Jewish Genealogy Family Finder. So far I have not entered myself in the JGFF, but this article is strong incentive to do so.