From the website: "The following collection of data contains the names and descriptions of taxable property of nearly 38,000 individuals who resided in 152 Massachusetts towns in 1771. Data include enumerations of the type and value of real estate and buildings, as well as tabulation of livestock and farm commodities produced.
This on-line version allows you to browse the data by selecting items to view and "drilling down" through totals for counties and towns to the holdings of individual taxpayers."
You can search by name or by use of several other filters.
NOTE: In order to use the interactive map, you have to have the Flash plug in for your browser. A link to download it is provided. You do not need the download to search the database.