Great website with data on the Boston housing market.
You can find out average list prices now, versus three, six, and twelve months ago, as well as trends in prices and inventory levels.
The more information, the better. I hope he adds median list prices, as well as sold data, as these are as important.
Also, the area analyzed is mostly within the city of Boston, but the data is skewed by including towns such as Watertown, Needham, and Newton, etc.