One of the benefits of being able to research Jewish families from all over the world is finding great new websites. I have just recently been using a wonderful site for those whose families came from Central and Eastern Europe, the former Soviet Union, and the Sephardic communities of Greece, Turkey and the Balkans. That site is Centropa.org.
Through interviews with elderly Jews, Centropa is building collections that will be treasures for many families. By adding photos to the oral histories, they are truly becoming a "Jewish Witness to a European Century" as their websites states.
Centropa.org is very easy to navigate. Simply click on the link in Red, that says, An Interactive Database of Jewish History. By doing so the page below will appear.
By clicking on whichever country you choose, a brief history will appear and you will the be able to search for those records. I clicked on Poland and the following appeared.
The resources available here for families are incredible, and I believe will only get better. Take sometime and get to know the website, even if you don't have family in these locations, remembering those who gave so much, can only help us know ourselves.