The new Surnames By Town database, http://SurnamesByTown.com, is now accepting submissions of surnames from researchers who already know the exact town in Potenza or Matera province where their ancestors lived. This database is designed to avoid wasting time on messages from people researching the same surname, but in a different place from your. If the lines cross, then presumably there must be an event in common, and both researchers would submit the surname(s) associated with the event, under the town where it happened. In other words, it's really not very useful to compare notes until they have something in common. See http://SurnamesByTown.com/Italy/Potenza/potenza.html to see how the database looks.