Burt Masnick asked for leads on reabbinical families genealogical material.
In my opinion, the best source in English for rabbinical families and their genealogies is Neil Rosenstein's "the Unbroken Chain".
There are numerous collections and sources in Hebrew, among which I have found Meir Wunder's "Meorei Galitzia" invaluable for rabbinical families with roots in Galicia.
