Many of the big questions about personal data have already been asked of other technologies, but location technologies raise new questions. Warehousing data and data mining are examples of concerns that already exist but so far there are no examples of the concerns that location data will add. It is precisely because we can only speculate about these new concerns, that we must try to anticipate them. Many of the obvious and the incremental changes introduced by location technologies are likely to be significant during the long-term.