The Memorial Book of the Victims of the Persecution of Jews under the National Socialist Tyranny in Germany 1933 Р1945 is the an important database when doing Jewish research. On this site you will also find a lot of historical information on the holocaust, for example the chronology of deportations from Germany and other European countries or the expulsion of Polish Jews from the German Reich 1938/1939. Other Jewish records by the Reichssippenamt can be found at State archive of Saxony in Leipzig, most of them have been filmed by the LDS. Check out what records are available  in the finding book of the State archive.