Historic Map Works is building a business offering cadastral and other antique maps online; from their collection of 1.2 million maps, most of which were obtained by buying the companies who published them, more than half a million have been put online so far. It’s freely browsable, but it’s not free: zooming in closely requires an account with a positive balance, and there are fees associated with certain transactions. Mass High Tech Business News has more; via All Points Blog and GeoCarta.